misc: Beaglebone capemanager

A cape loader based on DT overlays and DT objects.

This is the beaglebone cape manager which allows capes to be automatically
probed and instantiated via means of a device tree overlay deduced from
the part-number and version contained on the cape's EEPROM.

The reference manual contains information about the specification
and the contents of the EEPROM.

http://beagleboard.org/static/beaglebone/latest/Docs/Hardware/BONE_SRM.pdf



Documentation about the workings of the cape manager is located
in Documentation/misc-devices/bone_capemgr.txt

Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>