Make TopLevelSettings un-searchable and direct result to relevant page.

Fixes: 149372187
Test: manual & robotest
Change-Id: I9daca03d1c11a262f8e3b55bb46aabbc035ece96
diff --git a/res/xml/display_settings.xml b/res/xml/display_settings.xml
index 4bf0c82..35b7b4d 100644
--- a/res/xml/display_settings.xml
+++ b/res/xml/display_settings.xml
@@ -17,7 +17,9 @@
 <PreferenceScreen
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:settings="http://schemas.android.com/apk/res-auto"
+    android:key="display_settings_screen"
     android:title="@string/display_settings"
+    settings:keywords="@string/keywords_display"
     settings:initialExpandedChildrenCount="5">
 
     <com.android.settingslib.RestrictedPreference