dt-bindings: arm: rockchip: add Theobroma Systems PX30-µQ7 (Ringneck) with Haikou

Add entry for the Theobroma Systems PX30-µQ7 (Ringneck) with Haikou
devkit.
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Link: https://lore.kernel.org/r/20220930-upstream-ringneck-v2-2-6671694b6934@theobroma-systems.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/arm/rockchip.yaml

@@ -709,6 +709,11 @@ properties:
           - const: rockchip,rv1108-evb
           - const: rockchip,rv1108
 
+      - description: Theobroma Systems PX30-uQ7 with Haikou baseboard
+        items:
+          - const: tsd,px30-ringneck-haikou
+          - const: rockchip,px30
+
       - description: Theobroma Systems RK3368-uQ7 with Haikou baseboard
         items:
           - const: tsd,rk3368-lion-haikou