Add Advanced button to Apps & notifications page.

- set the progressive mixin to show 3 items initially.

Change-Id: I874982e9b230d5b6afe4f2ced8e8c8c4dd84ba79
Fix: 36177949
Test: visual

src/com/android/settings/applications/AppAndNotificationDashboardFragment.java

@@ -42,6 +42,12 @@ public class AppAndNotificationDashboardFragment extends DashboardFragment {
         return TAG;
     }
 
+    @Override
+    public void onAttach(Context context) {
+        super.onAttach(context);
+        mProgressiveDisclosureMixin.setTileLimit(3);
+    }
+
     @Override
     protected int getPreferenceScreenResId() {
         return R.xml.app_and_notification;