Support for device specific key handlers

Co-authored-by: Alexander Hofbauer <alex@derhofbauer.at>
Co-authored-by: Danesh Mondegarian <daneshm90@gmail.com>
Co-authored-by: Jorge Ruesga <jorge@ruesga.com>
Co-authored-by: Paul Keith <javelinanddart@gmail.com>
Co-authored-by: Steve Kondik <steve@cyngn.com>
Co-authored-by: Zhao Wei Liew <zhaoweiliew@gmail.com>
Change-Id: Ie65a89cd7efd645622d99d47699df847bc3ad96b