Split ring and notification vibration settings

Synchronize settings between sound and accessibility menus

Bug: 116172311
Test: See accessibility vibration settings - ring and notification
settings sould be separate. Try changing vibration settings in sound and
accessibility menus - the settings should stay in sync.

Change-Id: I515a7188cdf5a26a229ac8f08c6fcfe98e2f91a0

src/com/android/settings/accessibility/NotificationVibrationPreferenceFragment.java

@@ -44,6 +44,11 @@ public class NotificationVibrationPreferenceFragment extends VibrationPreference
         return Settings.System.NOTIFICATION_VIBRATION_INTENSITY;
     }
 
+    @Override
+    protected String getVibrationEnabledSetting() {
+        return "";
+    }
+
     @Override
     protected int getPreviewVibrationAudioAttributesUsage() {
         return AudioAttributes.USAGE_NOTIFICATION;