audioserver: Ensure minimum binder priority set

Prevents binder threads from waiting as runnable and
helps priority inversion on mutexes.  Those issues
can cause sporadic audio glitches.

Test: instrumeted logging
Bug: 261646227
Change-Id: Ic96f8c2f35fc1096d560b16a702392c807f0504e
diff --git a/services/audiopolicy/service/AudioPolicyService.cpp b/services/audiopolicy/service/AudioPolicyService.cpp
index 83a11fb..70349c2 100644
--- a/services/audiopolicy/service/AudioPolicyService.cpp
+++ b/services/audiopolicy/service/AudioPolicyService.cpp
@@ -202,6 +202,7 @@
       mCaptureStateNotifier(false),
       mCreateAudioPolicyManager(createAudioPolicyManager),
       mDestroyAudioPolicyManager(destroyAudioPolicyManager) {
+      setMinSchedulerPolicy(SCHED_NORMAL, ANDROID_PRIORITY_AUDIO);
 }
 
 void AudioPolicyService::loadAudioPolicyManager()