sdhci: add num index for multi controllers case

Some devices have several controllers; need add the index info to
device slot name host->slot_desc[]

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index e4d77b0..d5a38f1 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -208,6 +208,7 @@
 
 	unsigned long		quirks;
 
+	int			index;		/* Index for chip0, chip1 ...*/
 	int			num_slots;	/* Slots on controller */
 	struct sdhci_host	*hosts[0];	/* Pointers to hosts */
 };