FM Radio: Add support for FM Radio in Android

Creating interface and framework for using FM Radio
RX and TX from different vendors.

Change-Id: I1a71aed01bfffdddfabf1cdfbfa3707cb1ed016b

Signed-off-by: Benn Porscke <benn.porscke@stericsson.com>

Conflicts:

	core/pathmap.mk
	target/product/core.mk
build: work around missing readlink -f on Mac

Change-Id: I5d56366cf33a2b02f1886c87815d00cff279779d
custom -> dk