Only suspend package from system or shell

Test: manual
Bug: 148059175
Change-Id: I50ee768e792266ad2091f1913168e89d5d1463ed
Merged-In: I50ee768e792266ad2091f1913168e89d5d1463ed
(cherry picked from commit 1c943a2670)
(cherry picked from commit adc39de3a1)

services/core/java/com/android/server/notification/NotificationManagerService.java

@@ -7101,6 +7101,7 @@ public class NotificationManagerService extends SystemService {
 
     @VisibleForTesting
     protected void simulatePackageSuspendBroadcast(boolean suspend, String pkg) {
+        checkCallerIsSystemOrShell();
         // only use for testing: mimic receive broadcast that package is (un)suspended
         // but does not actually (un)suspend the package
         final Bundle extras = new Bundle();