mmc: sunxi: Add DM_MMC support for H6

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>
diff --git a/drivers/mmc/sunxi_mmc.c b/drivers/mmc/sunxi_mmc.c
index 1259e62..1e13a06 100644
--- a/drivers/mmc/sunxi_mmc.c
+++ b/drivers/mmc/sunxi_mmc.c
@@ -680,6 +680,10 @@
 	.mclk_offset = 0x88,
 };
 
+static const struct sunxi_mmc_variant sun50i_h6_variant = {
+	.mclk_offset = 0x830,
+};
+
 static const struct udevice_id sunxi_mmc_ids[] = {
 	{
 	  .compatible = "allwinner,sun4i-a10-mmc",
@@ -705,6 +709,14 @@
 	  .compatible = "allwinner,sun50i-a64-emmc",
 	  .data = (ulong)&sun4i_a10_variant,
 	},
+	{
+	  .compatible = "allwinner,sun50i-h6-mmc",
+	  .data = (ulong)&sun50i_h6_variant,
+	},
+	{
+	  .compatible = "allwinner,sun50i-h6-emmc",
+	  .data = (ulong)&sun50i_h6_variant,
+	},
 	{ /* sentinel */ }
 };