mediaserver: grant perms from domain_deprecated

In preparation of removing permissions from domain_deprecated.

Addresses:
avc: denied { getattr } for path="/proc/self" dev="proc" ino=4026531841 scontext=u:r:mediaserver:s0 tcontext=u:object_r:proc:s0 tclass=lnk_file permissive=1
avc: denied { read } for name="mediadrm" dev="mmcblk0p24" ino=209 scontext=u:r:mediaserver:s0 tcontext=u:object_r:system_file:s0 tclass=dir permissive=1
avc: denied { open } for path="/vendor/lib/mediadrm" dev="mmcblk0p24" ino=209 scontext=u:r:mediaserver:s0 tcontext=u:object_r:system_file:s0 tclass=dir permissive=1

Change-Id: Ibffa0c9a31316b9a2f1912ae68a8dcd3a4e671b7