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.de


Signed-off-by: Heiko Stuebner <heiko@sntech.de>