dt-bindings: Add vendor prefix for Vamrs Ltd.

Vamrs Ltd. is a hardware solutions provider based in China.

Website: http://vamrs.com/



Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>