dt-bindings: serial: snps-dw-apb-uart: Add Rockchip RK3576

Add a Rockchip RK3576 compatible.

Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20240918150704.1163581-2-detlev.casanova@collabora.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>