Ultrasound: Filter out the special key event for digital pen hovering cursor
Ultrasound hovering cursor uses a special key event. This event is relevant only for the InputReader that shows/hides the cursor accordingly. Therefore, if the event is sent from the ultrasound device it is filtered out in the InputReader and is not sent to applications. Change-Id: Id3a9718be6bdb144e80bfa32c0a18a9900071167
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