dt-bindings: vendor-prefixes: favor "gateworks" over "gw"

There are two vendor prefixes for Gateworks: "gw" and "gateworks".
Favor the longer one (more descriptive) and mark "gw" as deprecated so
it will not be used in new bindings.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20201003103335.23404-1-krzk@kernel.orgSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -425,6 +425,8 @@ patternProperties:
     description: Gumstix, Inc.
   "^gw,.*":
     description: Gateworks Corporation
+                 use "gateworks" vendor prefix
+    deprecated: true
   "^hannstar,.*":
     description: HannStar Display Corporation
   "^haoyu,.*":