add a helper to get the supported features for ONFI nand.
Also add the neccessary macros.
Signed-off-by: NHuang Shijie <b32955@freescale.com>
Reviewed-and-tested-by: NBrian Norris <computersforpeace@gmail.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>