mmc: dw_mmc: add exynos7870 DW MMC support

Add support for Exynos7870 DW MMC controllers, for both SMU and non-SMU
variants. These controllers require a quirk to access 64-bit FIFO in 32-bit
accesses (DW_MMC_QUIRK_FIFO64_32).

Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>
Link: https://lore.kernel.org/r/20250219-exynos7870-mmc-v2-3-b4255a3e39ed@disroot.org


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>