We should use hardware ecc on i.MX. While at it, add the optional
nand-bus-width property.
Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>
Acked-by: NLothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: NShawn Guo <shawn.guo@freescale.com>