m7-common: Add FM Support

Required to add FM support to the m7 and m7spr. FM Radio is not
supported by m7vzw on a hardware level.

This commit depends on:
http://review.cyanogenmod.org/#/c/73884/
http://review.cyanogenmod.org/#/c/73885/
http://review.cyanogenmod.org/#/c/73918/

Change-Id: Ia80aecdc4c676d1898577fda268c046a8166fb2c