sepolicy: mediaserver.te: Add read permission to dmabuf_system_heap_device

Following Hridya's patches, I found one more place where
dmabuf system heap access is needed in order to play back video
without ION

Audit error:
09-22 05:34:36.545   478   478 W NPDecoder-CL: type=1400 audit(0.0:65): avc: denied { read } for name="system" dev="tmpfs" ino=631 scontext=u:r:mediaserver:
s0 tcontext=u:object_r:dmabuf_system_heap_device:s0 tclass=chr_file permissive=0

Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I016a260b936a343a29f0e3bbb565b52bbcb0133a
1 file changed