RecordingActivityMonitor: remove spam from death events

Release death handler when its recorder is removed from tracking
to avoid logspam of "Unexpected event" messages.

Bug: 136279123
Test: atest android.media.cts.AudioRecordingConfigurationTest
      adb shell logcat | grep "Unexpected event"

Change-Id: I085ee545a07c7d3ada05c575878998a0e76a135b

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

@@ -86,6 +86,12 @@ public final class RecordingActivityMonitor implements AudioSystem.AudioRecordin
             return mIsActive && mConfig != null;
         }
 
+        void release() {
+            if (mDeathHandler != null) {
+                mDeathHandler.release();
+            }
+        }
+
         // returns true if status of an active recording has changed
         boolean setActive(boolean active) {
             if (mIsActive == active) return false;
@@ -417,6 +423,7 @@ public final class RecordingActivityMonitor implements AudioSystem.AudioRecordin
                     break;
                 case AudioManager.RECORD_CONFIG_EVENT_RELEASE:
                     configChanged = state.isActiveConfiguration();
+                    state.release();
                     mRecordStates.remove(stateIndex);
                     break;
                 default:
@@ -519,6 +526,10 @@ public final class RecordingActivityMonitor implements AudioSystem.AudioRecordin
                 return false;
             }
         }
+
+        void release() {
+            mRecorderToken.unlinkToDeath(this, 0);
+        }
     }
 
     /**