dt-bindings: arm: rockchip: Add Toybrick TB-RK3588X

Add devicetree binding for Toybrick TB-RK3588X board from Rockchip Toybrick.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Weizhao Ouyang <weizhao.ouyang@arm.com>
Signed-off-by: Elon Zhang <zhangzj@rock-chips.com>
Link: https://lore.kernel.org/r/20240221022902.751528-2-zhangzj@rock-chips.com


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