Limit the suggestions to be shown to 5.

- when creating the dashboard data, pass the sublist of suggestions to
cap the total number of suggestions to be shown to 5.
- if user swipe away the suggestion, it will only remove the suggestion
from the suggestion adapater, and will not trigger rebuilding the whole
UI.

Bug: 64072051
Change-Id: I1efabeb2a805c670007c631d3ccb0fdfbde7b55a
Fix: 63309218
Test: make RunSettingsRoboTests

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

@@ -251,10 +251,7 @@ public class DashboardSummary extends InstrumentedFragment
 
     @Override
     public void onSuggestionDismissed(Tile suggestion) {
-        mAdapter.onSuggestionDismissed();
-        // Refresh the UI to pick up suggestions that can now be shown because, say, a higher
-        // priority suggestion has been dismissed, or an exclusive suggestion category is emptied.
-        rebuildUI();
+        mAdapter.onSuggestionDismissed(suggestion);
     }
 
     private class SuggestionLoader extends AsyncTask<Void, Void, List<Tile>> {