Disable suggestion on low memory devices

Change-Id: I9d22170845661fc8b48b116c9b09f758926c096f
Fix: 63157777
Test: make RunSettingsRoboTests

src/com/android/settings/dashboard/suggestions/SuggestionFeatureProvider.java

@@ -29,6 +29,11 @@ import java.util.List;
 /** Interface should be implemented if you have added new suggestions */
 public interface SuggestionFeatureProvider {
 
+    /**
+     * Whether or not the whole suggestion feature is enabled.
+     */
+    boolean isSuggestionEnabled(Context context);
+
     /**
      * Returns true if smart suggestion should be used instead of xml based SuggestionParser.
      */