uboot-imx

mtd: spi: sf_dataflash: Add print message while erase error

Add the print message to tell us why the erase operation doesn't work.

Signed-off-by: Wenyou Yang <wenyou.yang@microchip.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jagan Teki <jagan@openedev.com>