Allow audio_server to access soundtrigger_middleware service

In order to update it when external capture is taking place.

Change-Id: I7620902bfdd93b3f80f3ab2921b6adae2e77166f
Bug: 142070343
diff --git a/private/audioserver.te b/private/audioserver.te
index 05e793c..067152f 100644
--- a/private/audioserver.te
+++ b/private/audioserver.te
@@ -40,6 +40,7 @@
 allow audioserver scheduling_policy_service:service_manager find;
 allow audioserver mediametrics_service:service_manager find;
 allow audioserver sensor_privacy_service:service_manager find;
+allow audioserver soundtrigger_middleware_service:service_manager find;
 
 # Allow read/write access to bluetooth-specific properties
 set_prop(audioserver, bluetooth_a2dp_offload_prop)