sepolicy: Allow all app domains to search sysfs_kgsl

Fixing below avc denails
type=1400 audit(0.0:86144): avc: denied { search } for
name="kgsl-3d0" dev="sysfs" ino=43551 scontext=u:r:mediaswcodec:s0

Change-Id: Ibf7a9a231119c23c4830538323587edbe95150a2