hammerhead: Add missing printf parameter to CONFIG_AUTOBOOT_PROMPT

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
diff --git a/include/configs/hammerhead.h b/include/configs/hammerhead.h
index ab13d2e..8e83daa 100644
--- a/include/configs/hammerhead.h
+++ b/include/configs/hammerhead.h
@@ -83,7 +83,7 @@
 #define CONFIG_AUTOBOOT			1
 #define CONFIG_AUTOBOOT_KEYED		1
 #define CONFIG_AUTOBOOT_PROMPT				\
-	"Press SPACE to abort autoboot in %d seconds\n"
+	"Press SPACE to abort autoboot in %d seconds\n", bootdelay
 #define CONFIG_AUTOBOOT_DELAY_STR	"d"
 #define CONFIG_AUTOBOOT_STOP_STR	" "