Use super method for Vibration preferences

onDisplayPreferenceDialog is overriden to handle BT related preferences
but VibrationPreferences require the super method of
onDisplayPreferenceDialog. Therefore if VibrationPreferences wants to
display a dialog, use the super method instead of the overriden method.

Bug: 150661723
Change-Id: I3f8e86e1d1f32fa6eae2798d3bad3cb48402db7b