dt-bindings: arm: rockchip: Add Cool Pi 4B

Add Cool Pi 4B, a SBC powered by RK3588S

Signed-off-by: Andy Yan <andyshrk@163.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231212124237.1897378-1-andyshrk@163.com


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