Change how we change the lcd density

This allows us to edit the props without re-zipping

Change-Id: I6d59ecf79f765009e57deabccd5de074b7a7d006
Revert "Revert "slim: Build stagefright ffmpeg plugin""

This reverts commit 7130751405ee48ab8b8746a350c42a10746a217f.
vendor: Update SELinux policy for sysinit

Change-Id: I41d4c25d9d6246cd2ca0a8ff3b5a4e114e3bc4d4
Add selinux policies for superuser

Change-Id: I878eaa9d25feaedf46e89083f91d6a21f4aff37a