Move bubble settings to their own page

To make room for graphics/longer descriptive text

Test: robotests
Bug: 129068779
Change-Id: Iac6ea43bd3a0cddc487ff3d1bbd8f35142294d01

res/xml/app_bubble_notification_settings.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2019 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"
+                  xmlns:settings="http://schemas.android.com/apk/res-auto"
+                  android:title="@string/bubbles_app_toggle_title"
+                  android:key="app_bubble_notification_settings">
+        <com.android.settingslib.widget.LayoutPreference
+            android:key="pref_app_header"
+            android:layout="@layout/settings_entity_header"/>
+
+        <com.android.settingslib.RestrictedSwitchPreference
+            android:key="bubble_pref"
+            android:title="@string/notification_bubbles_title"/>
+
+        <com.android.settingslib.widget.FooterPreference
+            android:key="notification_bubbles_footer"
+            android:title="@string/bubbles_feature_education"
+            android:selectable="false" />
+
+</PreferenceScreen>