GFRM200: over-air-download (OAD) support

	* mostly working code to detect and interact with OAD service
	* still debugging; waiting for sample firmware to test download
	* also: log hog/hid bytes (remote keypresses)
	* also: battery level check

Change-Id: I309430252f7ae4314676f82648637758bb7fc52d
5 files changed