sdhci: fix a typo

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index e28987d..05195ea 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -81,7 +81,7 @@
 
 #define SDHCI_BLOCK_GAP_CONTROL	0x2A
 
-#define SDHCI_WALK_UP_CONTROL	0x2B
+#define SDHCI_WAKE_UP_CONTROL	0x2B
 
 #define SDHCI_CLOCK_CONTROL	0x2C
 #define  SDHCI_DIVIDER_SHIFT	8