Make ManagedServices intents immutable

Test: make
Fixes: 154917989
Change-Id: Ic0198a1e09408713f234cf8b901b1b117d734afb

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

@@ -1312,7 +1312,7 @@ abstract public class ManagedServices {
         intent.putExtra(Intent.EXTRA_CLIENT_LABEL, mConfig.clientLabel);
 
         final PendingIntent pendingIntent = PendingIntent.getActivity(
-            mContext, 0, new Intent(mConfig.settingsAction), 0);
+            mContext, 0, new Intent(mConfig.settingsAction), PendingIntent.FLAG_IMMUTABLE);
         intent.putExtra(Intent.EXTRA_CLIENT_INTENT, pendingIntent);
 
         ApplicationInfo appInfo = null;