legacy/alsa_sound: Add support for FM feature.

Change-Id: Ide18fa63ae589cf6278baf4a02da874c839b272b
FM Radio: Support for new audio API

Change-Id: Ide18fa63ae589cf6278baf4a02da874c839b272b

Conflicts:
	alsa_sound/ALSADevice.cpp
	alsa_sound/AudioHardwareALSA.cpp
	alsa_sound/AudioHardwareALSA.h
	alsa_sound/AudioPolicyManagerALSA.cpp
	alsa_sound/audio_hw_hal.cpp