Access AudioPlaybackConfiguration players under mPlayerLock

Test: build and flash to Panther
Test: run cts-dev -m CtsMediaAudioTestCases  -t android.media.audio.cts.AudioPlaybackConfigurationTest
Bug: 247551216
Change-Id: I7bd9b61ad46ba2bf2395daad8257f9cd79c73159
(cherry picked from commit b89353ba0f)
Merged-In: I7bd9b61ad46ba2bf2395daad8257f9cd79c73159

services/core/java/com/android/server/audio/PlaybackActivityMonitor.java

@@ -989,21 +989,16 @@ public final class PlaybackActivityMonitor
     }
 
     List<AudioPlaybackConfiguration> getActivePlaybackConfigurations(boolean isPrivileged) {
-        synchronized(mPlayers) {
+        synchronized (mPlayerLock) {
             if (isPrivileged) {
                 return new ArrayList<AudioPlaybackConfiguration>(mPlayers.values());
             } else {
-                final List<AudioPlaybackConfiguration> configsPublic;
-                synchronized (mPlayerLock) {
-                    configsPublic = anonymizeForPublicConsumption(
+                return anonymizeForPublicConsumption(
                             new ArrayList<AudioPlaybackConfiguration>(mPlayers.values()));
-                }
-                return configsPublic;
             }
         }
     }
 
-
     /**
      * Inner class to track clients that want to be notified of playback updates
      */