backup service: fall back to /sbin/bu

Change-Id: I46c67a401da8de92d7ef81ad40c565bb1d2ef93b
init: allow media to set persist.camera property

Change-Id: Ife28c39da107b53b9c497be9fcbad3159031b8fe
Revert "init: allow media to set persist.camera property"

!!! PROPERTY_PERMS_APPEND !!!

This reverts commit 49506dc95cabe45332a34f9ce594a3115c4428ee

Change-Id: I815f0145845336834f9022ceba25527c47a9bd5c