SE policy for tuner service.

Test: make; acloud;  tuner sample input
Change-Id: I651632ec7f4ba79d94738c11c343f63510e59aa6
diff --git a/private/service_contexts b/private/service_contexts
index cca54c7..8f1e386 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -151,6 +151,7 @@
 media.resource_observer                   u:object_r:mediaserver_service:s0
 media.sound_trigger_hw                    u:object_r:audioserver_service:s0
 media.drm                                 u:object_r:mediadrmserver_service:s0
+media.tuner                               u:object_r:mediatuner_service:s0
 media_projection                          u:object_r:media_projection_service:s0
 media_resource_monitor                    u:object_r:media_session_service:s0
 media_router                              u:object_r:media_router_service:s0