mtd: rawnand: Fix JEDEC detection

nand_jedec_detect() should return 1 when the PARAM page parsing
succeeds, otherwise the core considers JEDEC detection failed and falls
back to ID-based detection.

Fixes: 480139d9

 ("mtd: rawnand: get rid of the JEDEC parameter page in nand_chip")
Cc: <stable@vger.kernel.org>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>