mmc: s3c: Add SD driver

Implement SD driver for the S3C24xx family. This implementation
is currently only capable of using the PIO transfers, DMA is not
supported.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Lukasz Majewski <l.majewski@samsung.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Cc: Pantelis Antoniou <panto@antoniou-consulting.com>
Cc: Vladimir Zapolskiy <vz@mleia.com>
Acked-by: Pantelis Antoniou <panto@antoniou-consulting.com>
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index f5be96f..464cee1 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -22,6 +22,7 @@
 obj-$(CONFIG_SDHCI) += sdhci.o
 obj-$(CONFIG_BCM2835_SDHCI) += bcm2835_sdhci.o
 obj-$(CONFIG_KONA_SDHCI) += kona_sdhci.o
+obj-$(CONFIG_S3C_SDI) += s3c_sdi.o
 obj-$(CONFIG_S5P_SDHCI) += s5p_sdhci.o
 obj-$(CONFIG_SH_MMCIF) += sh_mmcif.o
 obj-$(CONFIG_SPEAR_SDHCI) += spear_sdhci.o