msm8960: move fstab to device trees

* remove manual mounts in init, we should be mounting
  everything via fstab now

Change-Id: I5dc8871c35fe81a563f5d36856c61add402d3b29
sepolicy: remove vfat access for ueventd

* we'll give the partition a context when we mount rather
  than giving ueventd full reigns on the vfat context

Change-Id: I5887307ee59b8eab5de825243cbb036764002ae8