devicetree/bindings: Add GCW vendor prefix

Game Consoles Worldwide, mostly known under the acronym GCW, is the
creator of the GCW Zero open-source video game system.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Acked-by: Rob Herring <robh@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Maarten ter Huurne <maarten@treewalker.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/18489/Signed-off-by: James Hogan <jhogan@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -123,6 +123,7 @@ focaltech	FocalTech Systems Co.,Ltd
 friendlyarm	Guangzhou FriendlyARM Computer Tech Co., Ltd
 fsl	Freescale Semiconductor
 fujitsu	Fujitsu Ltd.
+gcw Game Consoles Worldwide
 ge	General Electric Company
 geekbuying	GeekBuying
 gef	GE Fanuc Intelligent Platforms Embedded Systems, Inc.