Enable FM
Merged with https://github.com/CyanogenMod/android_device_sony_montblanc-common/commit/0f86f877f07c7e9d9de7939012d0a19aa9ae2175
and https://github.com/CyanogenMod/android_device_sony_montblanc-common/commit/52cedeea40957113358f92780d7f927414fcc73a