mtd_to_nand() was recently introduced to avoid direct accesses to the
mtd->priv field. Update all blackfin specific implementations to use
this helper.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: NBrian Norris <computersforpeace@gmail.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>