Sepolicy rules for initial media quality framework.

We add a new system service (MediaQualityService) and manager (MediaQuality) with feature flag. This service will standardize APIs for Android TV setting in Android W to streamline vendor development process for TV settings.

Bug: 371041195
Bug: 348412562
Test: m
Test: Gambit TV
Change-Id: Id20a1d7bb5b3ab5310f8ae7ade9b127e13cee4b8
diff --git a/private/service_contexts b/private/service_contexts
index 7c3efc7..6275b3a 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -337,6 +337,7 @@
 media_communication                       u:object_r:media_communication_service:s0
 media_metrics                             u:object_r:media_metrics_service:s0
 media_projection                          u:object_r:media_projection_service:s0
+media_quality                             u:object_r:media_quality_service:s0
 media_resource_monitor                    u:object_r:media_session_service:s0
 media_router                              u:object_r:media_router_service:s0
 media_session                             u:object_r:media_session_service:s0