Move WiFi/Bluetooth scanning toggles to new pages

Screenshots: http://shortn/_ZmO6y9Zi5S

Bug: 180533061
Test: on device
Change-Id: I1223c9f5641bcc24b3e16af45138643f62849b8b

res/xml/location_services_wifi_scanning.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2021 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/location_scanning_wifi_always_scanning_title">
+
+        <com.android.settingslib.widget.MainSwitchPreference
+            android:key="wifi_always_scanning_switch"
+            android:title="@string/location_scanning_wifi_always_scanning_title"
+            settings:controller="com.android.settings.location.WifiScanningMainSwitchPreferenceController"/>
+
+        <com.android.settingslib.widget.FooterPreference
+            android:key="wifi_always_scanning_footer"
+            android:title="@string/location_scanning_wifi_always_scanning_description"
+            android:selectable="false"
+            settings:searchable="false"/>
+
+</PreferenceScreen>