Add node to support mmc controller inside of IPQ6018. This controller supports both eMMC and SD cards. Tested with: eMMC (HS200) SD Card (SDR50/SDR104) Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn> Link: https://lore.kernel.org/r/20240620150122.1406631-3-amadeus@jmu.edu.cn Signed-off-by: Bjorn Andersson <andersson@kernel.org>