Remove obsolete assets.

Bug: 5002409
Change-Id: If9e544b347ca55d0344225eff00bafed180edf8c

packages/SystemUI/res/drawable/notify_panel_bg_protect_tiled.xml

@@ -1,22 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2011 The Android Open Source Project
-
-     Licensed under the Apache License, Version 2.0 (the "License");
-     you may not use this file except in compliance with the License.
-     You may obtain a copy of the License at
-  
-          http://www.apache.org/licenses/LICENSE-2.0
-  
-     Unless required by applicable law or agreed to in writing, software
-     distributed under the License is distributed on an "AS IS" BASIS,
-     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-     See the License for the specific language governing permissions and
-     limitations under the License.
--->
-
-<bitmap
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    android:src="@drawable/notify_panel_bg_protect"
-    android:tileMode="repeat"
-    />
-