Mark the idle-maint trigger broadcast 'protected'

Bug: 26942536
Change-Id: I52d6b304fc894cad7957f84946178378c309f621
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index 7729d48c..40b0b95 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -292,9 +292,12 @@
     <protected-broadcast android:name="android.intent.action.REMOTE_BUGREPORT_FINISHED" />
     <protected-broadcast android:name="android.intent.action.REMOTE_BUGREPORT_DISPATCH" />
 
+    <!-- Legacy -->
     <protected-broadcast android:name="android.intent.action.ACTION_IDLE_MAINTENANCE_START" />
     <protected-broadcast android:name="android.intent.action.ACTION_IDLE_MAINTENANCE_END" />
 
+    <protected-broadcast android:name="com.android.server.task.controllers.IdleController.ACTION_TRIGGER_IDLE" />
+
     <protected-broadcast android:name="android.intent.action.HDMI_PLUGGED" />
 
     <protected-broadcast android:name="android.intent.action.PHONE_STATE" />