AudioService: RecordActivityMonitor: fix unbounded list growth

This CL fixes the growing list of Dispatchers in
RecordActivityMonitor by comparing dispatcher callback
via asBinder() method of the interface.

Bug: 242056995
Test: use the repro app from the bug
Change-Id: I3a2674dd339b84ecff609eef042ca41484a43255

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

@@ -337,7 +337,7 @@ public final class RecordingActivityMonitor implements AudioSystem.AudioRecordin
             boolean hasPublicClients = false;
             while (clientIterator.hasNext()) {
                 RecMonitorClient rmc = clientIterator.next();
-                if (rcdb.equals(rmc.mDispatcherCb)) {
+                if (rcdb.asBinder().equals(rmc.mDispatcherCb.asBinder())) {
                     rmc.release();
                     clientIterator.remove();
                 } else {