mtd: rawnand: sunxi: Clean up chips after failed init

If a chip fails to initialize, we need to clean up any chips that were
already initialized/registered.

Fixes: 1fef62c1 ("mtd: nand: add sunxi NAND flash controller support")
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20221229181526.53766-2-samuel@sholland.org