at91: Correct CONFIG_AUTOBOOT_PROMPT definition for pm9263

This is not currently used, since autoboot is not enabled for this
board, but the string is missing a parameter. Add it.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Acked-by: NAndreas Bießmann <andreas.devel@googlemail.com>

include/configs/pm9263.h

@@ -355,7 +355,7 @@
 
 #define CONFIG_BOOTCOMMAND		"run flashboot"
 #define CONFIG_ROOTPATH			"/ronetix/rootfs"
-#define CONFIG_AUTOBOOT_PROMPT		"autoboot in %d seconds\n"
+#define CONFIG_AUTOBOOT_PROMPT		"autoboot in %d seconds\n", bootdelay
 
 #define CONFIG_CON_ROT			"fbcon=rotate:3 "
 #define CONFIG_BOOTARGS			"root=/dev/mtdblock4 rootfstype=jffs2 "\