fstab: persist partition does not need trimming

Fixes the following denial:

avc: denied { read } for comm="vold" name="/" dev="mmcblk0p4" ino=2
scontext=u:r:vold:s0 tcontext=u:object_r:persist_file:s0 tclass=dir

(cherry picked from commit 2f86d53946fc3589024b05c32972bea64f3f94ed)
Bug: 19624276
Change-Id: Ia2116a7c2ad744fd5b4d9b4e28da2bbca68b9133
1 file changed