ARM: kirkwood: add mvsdio driver

This patch add Marvell kirkwood MVSDIO/MMC driver
and enable it for Sheevaplugs and OpenRD boards.

Signed-off-by: Gerald Kerma <drEagle@doukki.net>
Reviewed-by: Stefan Roese <sr@denx.de>
Acked-by: Pantelis Antoniou <panto@antoniou-consulting.com>
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index 34febf5..f5be96f 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -37,3 +37,4 @@
 else
 obj-$(CONFIG_GENERIC_MMC) += mmc_write.o
 endif
+obj-$(CONFIG_MVEBU_MMC) += mvebu_mmc.o