mpc83xx: set 64BIT_VSPRINTF for boards using nand_util

When enabling NAND support for a board, one must also define
CONFIG_SYS_64BIT_VSPRINTF because this is needed in nand_util.c
for correct output.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Cc: Dave Liu <daveliu@freescale.com>
Cc: Ron Madrid <ron_madrid@sbcglobal.net>
Cc: Anton Vorontsov <avorontsov@ru.mvista.com>
diff --git a/include/configs/MPC8315ERDB.h b/include/configs/MPC8315ERDB.h
index e03a107..4cf48f7 100644
--- a/include/configs/MPC8315ERDB.h
+++ b/include/configs/MPC8315ERDB.h
@@ -226,6 +226,7 @@
 #define CONFIG_MTD_NAND_VERIFY_WRITE	1
 #define CONFIG_CMD_NAND			1
 #define CONFIG_NAND_FSL_ELBC		1
+#define CONFIG_SYS_64BIT_VSPRINTF	/* needed for nand_util.c */
 
 #define CONFIG_SYS_BR1_PRELIM	( CONFIG_SYS_NAND_BASE \
 				| (2<<BR_DECC_SHIFT)	/* Use HW ECC */ \