Follow-up on bug #65298216: DeviceIdleController needs to...

...watch interactivity, not display state

Fix locking.

Bug: 65298216
Test: manual
Change-Id: If761ce73c82c23295720aea73c3a7fdda40ceedf

services/core/java/com/android/server/DeviceIdleController.java

@@ -403,7 +403,9 @@ public class DeviceIdleController extends SystemService
     private final BroadcastReceiver mInteractivityReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
-            updateInteractivityLocked();
+            synchronized (DeviceIdleController.this) {
+                updateInteractivityLocked();
+            }
         }
     };