Add permission for NetworkOverLimitActivity.

Bug: 6421080
Change-Id: Icefdf3da7a4a421d27aa1449ac01ea8ae1451d49

Author: jsharkey

packages/SystemUI/AndroidManifest.xml

@@ -22,6 +22,7 @@
     <uses-permission android:name="android.permission.READ_PHONE_STATE" />
     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
     <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
+    <uses-permission android:name="android.permission.MANAGE_NETWORK_POLICY" />
 
     <!-- Physical hardware -->
     <uses-permission android:name="android.permission.MANAGE_USB" />