BeaglePlay & BeagleConnet Freedom basic setup

We need to provide documentation for:

• BCF Zephyr firmare (greybus-node)
• BeaglePlay CC1352P7 (greybus-svc)
• BeaglePlay driver (greybus)
• Provide alternative to use bbb.io 6.1 kernel that contains mikrobus + gb_beagleplay patches.
• Provide alternative to use 6.1 flasher images which also contains cc1352 firmware.