Blackfin: enable 64bit printf for nand

Since the NAND code now uses 64bit code, make sure we enable support for
ADI Blackfin boards in printf to avoid the warning:
nand_util.c:45:2: warning: #warning Please define CONFIG_SYS_64BIT_VSPRINTF for correct output!

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
1 file changed