Add borders to the Automatic Storage Management switch.

This adds a top and bottom line to the switch.

Change-Id: Ida01c3f28c201a9203b06c9e0c147b5171fe3781
Fixes: 36223332
Test: Manual

res/xml/storage_dashboard_fragment.xml

@@ -16,6 +16,7 @@
 
 <PreferenceScreen
     xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:settings="http://schemas.android.com/apk/res/com.android.settings"
     android:title="@string/storage_settings"
     android:orderingFromXml="false">
     <com.android.settings.deviceinfo.storage.StorageSummaryDonutPreference
@@ -26,11 +27,14 @@
         android:key="toggle_asm"
         android:title="@string/automatic_storage_manager_preference_title"
         android:icon="@drawable/ic_settings_storage"
-        android:order="1" />
+        android:order="1"
+        settings:allowDividerAbove="true"
+        settings:allowDividerBelow="true"/>
     <com.android.settings.deviceinfo.storage.StorageItemPreferenceAlternate
         android:key="pref_photos_videos"
         android:title="@string/storage_photos_videos"
-        android:order="2" />
+        android:order="2"
+        settings:allowDividerAbove="true" />
     <com.android.settings.deviceinfo.storage.StorageItemPreferenceAlternate
         android:key="pref_music_audio"
         android:title="@string/storage_music_audio"