mmc: Move host and card drivers to subdirs

Clean up the drivers/mmc directory by moving card and host drivers
into subdirectories.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
diff --git a/drivers/mmc/card/Kconfig b/drivers/mmc/card/Kconfig
new file mode 100644
index 0000000..01a9fd3
--- /dev/null
+++ b/drivers/mmc/card/Kconfig
@@ -0,0 +1,17 @@
+#
+# MMC/SD card drivers
+#
+
+comment "MMC/SD Card Drivers"
+	depends MMC
+
+config MMC_BLOCK
+	tristate "MMC block device driver"
+	depends on MMC && BLOCK
+	default y
+	help
+	  Say Y here to enable the MMC block device driver support.
+	  This provides a block device driver, which you can use to
+	  mount the filesystem. Almost everyone wishing MMC support
+	  should say Y or M here.
+