dt-bindings: Add vendor prefix for GeekBuying.com

Use "geekbuying".
Signed-off-by: NAndreas Färber <afaerber@suse.de>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -91,6 +91,7 @@ firefly	Firefly
 focaltech	FocalTech Systems Co.,Ltd
 fsl	Freescale Semiconductor
 ge	General Electric Company
+geekbuying	GeekBuying
 GEFanuc	GE Fanuc Intelligent Platforms Embedded Systems, Inc.
 gef	GE Fanuc Intelligent Platforms Embedded Systems, Inc.
 geniatech	Geniatech, Inc.