* Use a much smaller-in-scope west.yml, loading less modules
* Add CC1352R1 LaunchpadXL support to `sensortest`
* Simplify the device selection in `sensortest`
* Add dummy nodes to the device tree to avoid errors, even if the device
  isn't there

Start saving some instructions for setting up the build host.

Currently having difficulty with BeagleConnect Freedom rev C2 samples
communicating as gateway devices. 802.15.4 2.4GHz is working fine as end nodes.

Now sw/build-firmware.sh will build all the firmware projects. Trying to
keep everything aligned between the CI and quick build scripts for
testing was becoming too much.

While combining MSP430 and CC1352 builds into a single script might make
it a bit more fragile, the code should be becoming a bit more stable.

Submitting this to kick off a CI build using the script!

* New Zephyr with upstream merge of some more code (raw mode)
* Zephyr HDC20X0 driver
* Board dts update for HDC20X0 driver
* bcf_sensortest update for HDC20X0 driver
* Unified MSP430 firmware (HDLC + UART pass-through)
* Add demo script for bcf_sensortest broadcast UDP packets
* Small feedback on build-firmware.sh script
* CI adjust MSP430 builds to only one image
* UART update in some flash scripts (default to /dev/ttyACM0)

```
uart:~$ *** Booting Zephyr OS build zephyr-v2.4.0-1244-g9e3c5d8f7352  ***
[00:00:00.005,584] <inf> lis2dh: bus=I2C_0 fs=2, odr=0x4 lp_en=0x8 scale=9576
[00:00:00.013,153] <inf> net_config: Initializing network
[00:00:00.113,159] <inf> net_config: IPv6 address: 2001:db8::1
[00:00:00.113,220] <inf> net_config: IPv6 address: 2001:db8::1
[00:00:00.113,952] <inf> beagleconnect_freedom: opening device 2.4G LED
[00:00:00.113,983] <inf> beagleconnect_freedom: opening device SubG LED
[00:00:00.113,983] <inf> beagleconnect_freedom: opening device User Button
[00:00:00.114,013] <inf> beagleconnect_freedom: opening device OPT3001-LIGHT
[00:00:00.114,044] <inf> beagleconnect_freedom: opening device LIS2DE12-ACCEL
[00:00:05.558,227] <inf> beagleconnect_freedom: User Button event
[00:00:05.558,441] <inf> beagleconnect_freedom: OPT3001-LIGHT: l:  62.200000
[00:00:05.558,868] <inf> beagleconnect_freedom: LIS2DE12-ACCEL: x:  1.225728
[00:00:05.558,990] <inf> beagleconnect_freedom: LIS2DE12-ACCEL: y: -1.072512
[00:00:05.559,112] <inf> beagleconnect_freedom: LIS2DE12-ACCEL: z: -9.959040
[00:00:24.371,185] <inf> beagleconnect_freedom: User Button event
[00:00:24.371,398] <inf> beagleconnect_freedom: OPT3001-LIGHT: l:  138.480000
[00:00:24.371,826] <inf> beagleconnect_freedom: LIS2DE12-ACCEL: x: -0.459648
[00:00:24.371,948] <inf> beagleconnect_freedom: LIS2DE12-ACCEL: y: -1.225728
[00:00:24.372,070] <inf> beagleconnect_freedom: LIS2DE12-ACCEL: z: -9.499392
[00:00:33.501,983] <inf> beagleconnect_freedom: User Button event
[00:00:33.502,197] <inf> beagleconnect_freedom: OPT3001-LIGHT: l:  67.360000
[00:00:33.502,624] <inf> beagleconnect_freedom: LIS2DE12-ACCEL: x: -7.354368
[00:00:33.502,746] <inf> beagleconnect_freedom: LIS2DE12-ACCEL: y: -2.451456
[00:00:33.502,868] <inf> beagleconnect_freedom: LIS2DE12-ACCEL: z: -6.435072
[00:00:40.776,123] <inf> beagleconnect_freedom: User Button event
[00:00:40.776,336] <inf> beagleconnect_freedom: OPT3001-LIGHT: l:  58.820000
[00:00:40.776,763] <inf> beagleconnect_freedom: LIS2DE12-ACCEL: x: -1.991808
[00:00:40.776,885] <inf> beagleconnect_freedom: LIS2DE12-ACCEL: y:  0.153216
[00:00:40.777,008] <inf> beagleconnect_freedom: LIS2DE12-ACCEL: z: -10.265472
uart:~$ device list
devices:
- PINMUX
- UART_1
- UART_0
- TRNG
- sys_clock
- GPIO_0
- I2C_0
- SPI_0
- IEEE802154_0
- LIS2DE12-ACCEL
- OPT3001-LIGHT
uart:~$ sensor get LIS2DE12-ACCEL
channel idx=0 accel_x =  -2.145024
channel idx=1 accel_y =  -3.064320
channel idx=2 accel_z =  -9.192960
channel idx=3 accel_xyz x =  -2.145024 y =  -3.064320 z =  -9.192960
uart:~$ sensor get OPT3001-LIGHT
channel idx=17 light = 144.760000
uart:~$
```

Host with atusb:

```
$ ./rx.py
('fe80::8f2f:5a21:4b:1200%lowpan0', 54908, 0, 61)  '3l: 67.360000;4x:-7.354368;4y:-2.451456;4z:-6.435072;'
('fe80::8f2f:5a21:4b:1200%lowpan0', 54908, 0, 61)  '3l: 58.820000;4x:-1.991808;4y: 0.153216;4z:-10.265472;'
```

rx.py:
```
import socket
import sys
import struct
import time

sock = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind(('', 9999))
sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_LOOP, True)
mreq = struct.pack("16s15s".encode('utf-8'), socket.inet_pton(socket.AF_INET6, "ff02::1"), (chr(0) * 16).encode('utf-8'))
sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP, mreq)

while True:
  data, sender = sock.recvfrom(1024)
  print (str(sender) + '  ' + repr(data))

```

Summary of functionality (bug in button handler):
```
uart:~$ *** Booting Zephyr OS build zephyr-v2.4.0-1244-g9e3c5d8f7352  ***
[00:00:00.005,584] <inf> lis2dh: bus=I2C_0 fs=2, odr=0x4 lp_en=0x8 scale=9576
[00:00:00.013,122] <inf> net_config: Initializing network
[00:00:00.113,159] <inf> net_config: IPv6 address: 2001:db8::1
[00:00:00.113,220] <inf> net_config: IPv6 address: 2001:db8::1
[00:00:00.113,952] <inf> beagleconnect_freedom: opening device 2.4G LED
[00:00:00.113,983] <inf> beagleconnect_freedom: opening device SubG LED
[00:00:00.113,983] <inf> beagleconnect_freedom: opening device User Button
[00:00:00.114,013] <inf> beagleconnect_freedom: opening device OPT3001-LIGHT
[00:00:00.114,013] <inf> beagleconnect_freedom: opening device LIS2DE12-ACCEL
uart:~$ device list
devices:
- PINMUX
- UART_1
- UART_0
- TRNG
- sys_clock
- GPIO_0
- I2C_0
- SPI_0
- IEEE802154_0
- LIS2DE12-ACCEL
- OPT3001-LIGHT
uart:~$ sensor get OPT3001-LIGHT
channel idx=17 light = 121.080000
uart:~$ sensor get LIS2DE12-ACCEL
channel idx=0 accel_x =  -2.145024
channel idx=1 accel_y =  -2.145024
channel idx=2 accel_z =  -9.652608
channel idx=3 accel_xyz x =  -2.145024 y =  -2.145024 z =  -9.652608
[00:00:32.482,604] <inf> beagleconnect_freedom: User Button event
[00:00:32.482,910] <inf> beagleconnect_freedom: �n
[00:00:32.483,337] <inf> beagleconnect_freedom: �n
[00:00:32.483,459] <inf> beagleconnect_freedom: �n
[00:00:32.483,581] <inf> beagleconnect_freedom: �n
[00:00:33.482,696] <err> log: argument 0 in source beagleconnect_freedom log message "%s" missinglog_strdup().
[00:00:33.482,696] <err> log: argument 0 in source beagleconnect_freedom log message "%s" missinglog_strdup().
[00:00:33.482,727] <err> log: argument 0 in source beagleconnect_freedom log message "%s" missinglog_strdup().
[00:00:33.482,757] <err> log: argument 0 in source beagleconnect_freedom log message "%s" missinglog_strdup().
```