c1905: Add selinux policy from qcom-common

Change-Id: I5c7f04483461c344bcd55764c8ecae648924d168
c1905: Add length offset for data partition

 * When using footer style encryption metadata, we need to specify an
   offset on the length of the partition as well in order to make room
   for said footer. This was previously handled in the old
   recovery.fstab format.
 * Should fix the issue where the system explodes after a wipe.

Change-Id: Ie9ff93f96cbcdd217bec345eb25f8b53d878ceb2