dt-bindings: arm: rockchip: Add Powkiddy RGB10MAX3

The Powkiddy RGB10MAX3 is a handheld gaming device made by Powkiddy and
powered by the Rockchip RK3566 SoC.
Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240212184950.52210-7-macroalpha82@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/arm/rockchip.yaml

@@ -694,6 +694,7 @@ properties:
       - description: Powkiddy RK3566 Handheld Gaming Console
         items:
           - enum:
+              - powkiddy,rgb10max3
               - powkiddy,rgb30
               - powkiddy,rk2023
               - powkiddy,x55