mtd: rawnand: mpc5121: Remove unneeded semicolon

Fixes coccicheck warning:

drivers/mtd/nand/raw/mpc5121_nfc.c:441:2-3: Unneeded semicolon

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: zhengbin <zhengbin13@huawei.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>