No sound produced on global actions dialog pops up if no vibrator is present.

1. If the global gesture to enable accessibility is enabled there should
   be a haptic or auditory feedback after the global actions dialog pops up
   as a result of a long press on power. On devices with no vibrator an
   attempt to vibrate was performed evne if not hardware support exists
   As a result no sound was played because the it was assumed a haptic
   feedback was provided.

bug:7324903

Change-Id: Ic76db232d761a2899c1ca5f59ca55ff15ae575dd