I9100G: Refine SELinux PVR Policies

Also fix a typo.

avc:  denied  { entrypoint } for  pid=139 comm="init" path="/system/vendor/bin/pvrsrvctl_SGX540_120" dev=mmcblk0p9 ino=49250 scontext=u:r:pvrsrvinit:s0 tcontext=u:object_r:system_file:s0 tclass=file

avc:  denied  { search } for  pid=162 comm="mount" name="block" dev=tmpfs ino=2350 scontext=u:r:pvrsrvinit:s0 tcontext=u:object_r:block_device:s0 tclass=dir

avc:  denied  { remount } for  pid=168 comm="mount" scontext=u:r:pvrsrvinit:s0 tcontext=u:object_r:labeledfs:s0 tclass=filesystem

Change-Id: Ie5fba4722f1c61cb1bee1964bd0287cb1a733d39