This disables the NAND on remove() and the errorpath,
making sure the chipselect gets deasserted when the
NAND is not in use.

Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>