dt-bindings: vendor-prefixes: add OpenWrt

OpenWrt project (with the help of MediaTek and Banana Pi) has produced
its very first own hardware. It needs its own prefix.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20240527115933.7396-2-zajec5@gmail.comSigned-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -1084,6 +1084,8 @@ patternProperties:
     description: OpenPandora GmbH
   "^openrisc,.*":
     description: OpenRISC.io
+  "^openwrt,.*":
+    description: OpenWrt
   "^option,.*":
     description: Option NV
   "^oranth,.*":