Instead of accessing the gpmc_status register directly start
using the gpmc_nand_ops->nand_writebuffer_empty() helper
to check write buffer empty status.
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Acked-by: NBrian Norris <computersforpeace@gmail.com>
Acked-by: NTony Lindgren <tony@atomide.com>