MMC for PXA 27X (resubmit)

MMC support for X_Scale PXA is broken and does not work.
Mainly, the mmc_init() function cannot recognize current SD/MMC cards.
There were already some patches around the world but none of them was
merged into the official u-boot tree.

This patch makes order fixing this issue. Resubmit after code cleanup.

Applied and tested on PXA 270 (TrizepsIV module).

Signed-off-by: Stefano Babic <sbabic@denx.de>
diff --git a/include/part.h b/include/part.h
index 37b2b68..8407aa0 100644
--- a/include/part.h
+++ b/include/part.h
@@ -59,6 +59,7 @@
 #define IF_TYPE_USB		4
 #define IF_TYPE_DOC		5
 #define IF_TYPE_MMC		6
+#define IF_TYPE_SD		7
 
 /* Part types */
 #define PART_TYPE_UNKNOWN	0x00