dt-bindings: vendor-prefixes: add iMX6 Rex Project

Document vendor prefix for iMX6 Rex Project.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200926162811.5335-2-krzk@kernel.orgSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -878,6 +878,8 @@ patternProperties:
     description: Realtek Semiconductor Corp.
   "^renesas,.*":
     description: Renesas Electronics Corporation
+  "^rex,.*":
+    description: iMX6 Rex Project
   "^rervision,.*":
     description: Shenzhen Rervision Technology Co., Ltd.
   "^richtek,.*":