sepolicy: remove vfat rules

* update your fstab and add: context=u:object_r:firmware_file:s0
  to your modem partition's mnt flags

Change-Id: I445ea01c32e85a278ff93641bb84bb4d774659e2
Merge branch 'cm-12.0' of https://github.com/CyanogenMod/android_device_lge_g3-common into HEAD