dt-bindings: vendor-prefixes: document Powkiddy

Document Powkiddy (https://powkiddy.com/).
Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20231013183918.225666-2-macroalpha82@gmail.com

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -1081,6 +1081,8 @@ patternProperties:
     description: Powertip Tech. Corp.
   "^powervr,.*":
     description: PowerVR (deprecated, use img)
+  "^powkiddy,.*":
+    description: Powkiddy
   "^primux,.*":
     description: Primux Trading, S.L.
   "^probox2,.*":