fmradio: cleanup QCOM_FM_ENABLED/STE_FM defs and ifdef

Change-Id: Ia34dca04e6b9de3509987ad9d88a5fecc3820e2f
qcom-fm: audio: add support for FM feature

-Add set_fm_volume() to set handle fm volume

Change-Id: I2a2c6a60b9855d9360ff8fb90849517e77e5faab

Conflicts:

	audio/AudioPolicyManagerBase.cpp
	include/hardware_legacy/AudioSystemLegacy.h