uboot-imx

mtd: nand: use loff_t for offset

nand_util currently uses size_t which is arch dependent and not always a
unsigned long.  Now use loff_t, as does the linux mtd layer.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>