Fix audio focus logging

Fix error in audio focus dispatching log: the message value (here
  MSSG_FOCUS_CHANGE, which is 0) was logged instead of the focus
  value being sent to the audio focus listener.

Bug 25790720

Change-Id: I534ce8d1059c09a52e56c51acd60405ef3c4cda1

media/java/android/media/AudioManager.java

@@ -2149,7 +2149,7 @@ public class AudioManager {
                                 }
                                 if (listener != null) {
                                     Log.d(TAG, "AudioManager dispatching onAudioFocusChange("
-                                            + msg.what + ") for " + msg.obj);
+                                            + msg.arg1 + ") for " + msg.obj);
                                     listener.onAudioFocusChange(msg.arg1);
                                 }
                                 break;