arm64: dts: rockchip: Add sdmmc node to rk3588

Add SD Card node for RK3588s and RK3588.

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>
Link: https://lore.kernel.org/r/20230228103610.25108-1-lucas.tanure@collabora.com


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