dt-bindings: arm: rockchip: Add Theobroma-Systems RK3588 Q7 with baseboard

Add binding for the Tiger Q7 SoM when used in conjunction with the Haikou
baseboard.
Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
Reviewed-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240227164659.705271-3-heiko@sntech.deSigned-off-by: Heiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/arm/rockchip.yaml

@@ -906,6 +906,12 @@ properties:
           - const: tsd,rk3588-jaguar
           - const: rockchip,rk3588
 
+      - description: Theobroma Systems RK3588-Q7 with Haikou baseboard
+        items:
+          - const: tsd,rk3588-tiger-haikou
+          - const: tsd,rk3588-tiger
+          - const: rockchip,rk3588
+
       - description: Tronsmart Orion R68 Meta
         items:
           - const: tronsmart,orion-r68-meta