NAND: Add config option for imx27lite

We will get compilation warnings without
"CONFIG_SYS_64BIT_VSPRINTF" being defined
in the board config.

Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

include/configs/imx27lite.h

@@ -156,6 +156,7 @@
 #define CONFIG_SYS_NAND_BASE		0xd8000000
 #define CONFIG_JFFS2_NAND
 #define CONFIG_MXC_NAND_HWECC
+#define CONFIG_SYS_64BIT_VSPRINTF	/* needed for nand_util.c */
 
 /*
  * SD/MMC