mtd: rawnand: marvell: Use nand_cleanup() when the device is not yet registered

Do not call nand_release() while the MTD device has not been
registered, use nand_cleanup() instead.

Fixes: 02f26ecf

 ("mtd: nand: add reworked Marvell NAND controller driver")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-mtd/20200424164501.26719-4-miquel.raynal@bootlin.com