Use SwitchPreference in TrustAgentSettings.

Fixes bug 16900059

Change-Id: I52dcfd2a2651f8f770477df3c72176303a9d1b39

res/xml/security_settings_misc.xml

@@ -107,7 +107,7 @@
                 android:title="@string/manage_trust_agents"
                 android:summary="@string/manage_trust_agents_summary"
                 android:persistent="false"
-                android:fragment="com.android.settings.AdvancedSecuritySettings"/>
+                android:fragment="com.android.settings.TrustAgentSettings"/>
 
         <PreferenceScreen
                 android:key="screen_pinning_settings"

res/xml/trust_agent_settings.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2014 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.
+-->
+
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+    android:key="trust_agents"
+    android:title="@string/manage_trust_agents" />