mtd: rawnand: fsl_upm: Allocate the fsl_upm_nand object using devm_kzalloc()

This simplifies the init error path and remove function.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20200603134922.1352340-4-boris.brezillon@collabora.com