Add a few pages to search index.

- Data saver
- A few special permission access pages
   - Picture-in-picture
   - Premium sms
   - do not disturb access
- And a unrelated cleanup: move EmptyTextFragment from
  notification/ to widget/

Bug: 70720645
Test: robotests
Change-Id: I6a87f712bf81f9fd32fa9a3826fba851ca748409

src/com/android/settings/utils/ManagedServiceSettings.java

@@ -38,8 +38,8 @@ import com.android.internal.logging.nano.MetricsProto;
 import com.android.settings.R;
 import com.android.settings.Utils;
 import com.android.settings.core.instrumentation.InstrumentedDialogFragment;
-import com.android.settings.notification.EmptyTextSettings;
 import com.android.settings.widget.AppSwitchPreference;
+import com.android.settings.widget.EmptyTextSettings;
 import com.android.settingslib.applications.ServiceListing;
 
 import java.util.List;