NAND: Fix warning Please define CONFIG_SYS_64BIT_VSPRINTF...

Commit 8d2effea added a warning for configurations that use NAND
without defining the (then necessary) CONFIG_SYS_64BIT_VSPRINTF but
failed to fix the affected boards.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/include/configs/ASH405.h b/include/configs/ASH405.h
index 2ee4f80..694a87b 100644
--- a/include/configs/ASH405.h
+++ b/include/configs/ASH405.h
@@ -157,8 +157,10 @@
 #define CONFIG_SYS_NAND_CLE            (0x80000000 >> 2)   /* our CLE is GPIO2 */
 #define CONFIG_SYS_NAND_ALE            (0x80000000 >> 3)   /* our ALE is GPIO3 */
 
-#define CONFIG_SYS_NAND_SKIP_BAD_DOT_I 1       /* ".i" read skips bad blocks   */
-#define CONFIG_SYS_NAND_QUIET          1
+#define CONFIG_SYS_NAND_SKIP_BAD_DOT_I	1	/* ".i" read skips bad blocks   */
+#define CONFIG_SYS_NAND_QUIET		1
+
+#define CONFIG_SYS_64BIT_VSPRINTF	/* needed for nand_util.c */
 
 /*-----------------------------------------------------------------------
  * PCI stuff