dt-bindings: add compatible vendor prefix for CUI Devices

Add vendor prefix for CUI Devices.

Signed-off-by: Angelo Dureghello <angelo.dureghello@timesys.com>
Link: https://lore.kernel.org/r/20210821082658.4147595-2-angelo.dureghello@timesys.com


Signed-off-by: Mark Brown <broonie@kernel.org>