dt-bindings: mmc: rockchip-dw-mshc: Add RK3588 compatible string

Add RK3588 compatible string for SD interface.
Co-developed-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Lucas Tanure <lucas.tanure@collabora.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20230213152740.359055-1-lucas.tanure@collabora.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.yaml

@@ -39,6 +39,7 @@ properties:
               - rockchip,rk3368-dw-mshc
               - rockchip,rk3399-dw-mshc
               - rockchip,rk3568-dw-mshc
+              - rockchip,rk3588-dw-mshc
               - rockchip,rv1108-dw-mshc
               - rockchip,rv1126-dw-mshc
           - const: rockchip,rk3288-dw-mshc