dt-bindings: arm: amlogic: add Videostrong KII Pro bindings

Add the compatible for the Amlogic gxbb(s905) based kii pro

Signed-off-by: Mohammad Rasim <mohammad.rasim96@gmail.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>