Unlike other Allwinner SoC's, H6 uses a different MMC mod clock offset.
Connect that with the respective compatible string.
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> Reviewed-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Andre Przywara <andre.przywara@arm.com>