Add SELinux policy for accessing the AudioService

This is used by the playback notification API to get a reference to the
AudioService with the help of the ServiceManager.

Change-Id: I70324cf0579fd029ee9b3a20115bdab9106d24a8
Test: avd/avd_boot_test
Bug: 235521198
diff --git a/private/audioserver.te b/private/audioserver.te
index ca29373..7a5e8bc 100644
--- a/private/audioserver.te
+++ b/private/audioserver.te
@@ -43,6 +43,7 @@
 allow audioserver mediametrics_service:service_manager find;
 allow audioserver sensor_privacy_service:service_manager find;
 allow audioserver soundtrigger_middleware_service:service_manager find;
+allow audioserver audio_service:service_manager find;
 
 # Allow read/write access to bluetooth-specific properties
 set_prop(audioserver, bluetooth_a2dp_offload_prop)