Add DashboardItemAnimator to stop flash

When there is no offset change for identical holder in
animateChange, simply return and don't invoke the
resetAnimation.

Bug: 33198024
Test: make RunSettingsRoboTests
Change-Id: Ib83363873bc5f51e5bd71af5a013ee0756728d1a

src/com/android/settings/dashboard/DashboardAdapter.java

@@ -165,7 +165,7 @@ public class DashboardAdapter extends RecyclerView.Adapter<DashboardAdapter.Dash
         if (position != DashboardData.POSITION_NOT_FOUND) {
             // Since usually tile in parameter and tile in mCategories are same instance,
             // which is hard to be detected by DiffUtil, so we notifyItemChanged directly.
-            notifyItemChanged(position);
+            notifyItemChanged(position, mDashboardData.getItemTypeByPosition(position));
         }
     }