MediaTranscodingService: Add sepolicy for MediaTranscodingService.

Bug:145233472
Test: Build and flash the phone.
"adb shell dumpsys -l | grep media" shows media.transcoding service.

Change-Id: I48a42e7b595754989c92a8469eb91360ab6db7c6
diff --git a/private/mediaserver.te b/private/mediaserver.te
index d74ab95..195c3a5 100644
--- a/private/mediaserver.te
+++ b/private/mediaserver.te
@@ -10,3 +10,4 @@
 hal_client_domain(mediaserver, hal_omx)
 hal_client_domain(mediaserver, hal_codec2)
 
+allow mediaserver mediatranscoding_service:service_manager find;