qcom-fm: audio: add support for FM feature

Change-Id: Idd5c7a0364710d54809ef5d4c7b2404b22dc4cf6

Conflicts:

	include/media/IAudioFlinger.h
	media/libmediaplayerservice/StagefrightRecorder.cpp
	media/libstagefright/Android.mk
av: Fix FM radio compilation