mdpi drawables for Navigation Bar Quick Launch Shortcuts

Change-Id: Ie7f05ea58916f9a12479e15475eaabcd3931f0d2
Remove unnecessary updateSurfaceScreenOn call.

This change stops updateSurfaceScreenOn() from being called one time
right after another. It's called at the end of stayAwake(boolean awake),
which is called right before updateSurfaceScreenOn() in release().