mtd: rawnand: au1550nd: Get rid of the legacy interface implementation

Now that exec_op() is implemented we can get rid of all other hooks.

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/20200419193037.1544035-4-boris.brezillon@collabora.com