wpanusb_bc: enhancement for beagleconnect freedom Rev C2 gateway

* get valid channels from device
* with the changes Sub-G(requires SubG PA patch) works without issues
* sometimes host sets an invalid channel(like channel 0) for 2.4G, getting
valid channels from gateway device, ensures that this does not happen.
* change some of the non frequent DBG prints to INF.
* 2.4G fails at setting channel

depends on https://github.com/jadonk/wpanusb/pull/1



Signed-off-by: Vaishnav M A <vaishnav@beagleboard.org>

* Support auto-detect of HDLC on MSP430

Use USER_BOOT (15) as output, held low to signal HDLC mode
Repeat send and pulse USER_BOOT until HDLC ACK received
Update README

Also add increased drive strength for USER_BOOT pins, to be included
in zephyr at some point.

Use USER_BOOT (15) as output, held low to signal HDLC mode
Repeat send and pulse USER_BOOT until HDLC ACK received

* Add hooks for console
* Switch to memory slab for HDLC frames
* Use fixed buffer for UART receive
* Use HDLC I-Frames for WPAN packets to host
* Add LED1 blink on TX, LED2 blink on RX.
* Cleanup printk/debug messages
* Use beagleconnect_freedom board

Working gateway application

Apply set channel on start
Additional debug info
Add application options to Kconfig
Updated board config
Updated logging
Use single buffer fragment for radio send
Add overlay for subghz
Update instructions

Signed-off-by: Erik Larson <erik@statropy.com>

Add application options to Kconfig
Updated board config
Updated logging
Use single buffer fragment for radio send

Fix CRC escaping
Apply set channel on start
Additional debug info

Add submodule for board definition
Add board defaults for build

tx error ignored for now

Ignore radio tx failure

need to implement TX

Packet parsing and sending is ok, but overflowing uart rx and using too many net packets