mtd: rawnand: cafe_nand: Remove superfluous param doc and add another

mtd: rawnand: cafe_nand: Remove superfluous param doc and add another

Fixes the following W=1 kernel build warning(s):

 drivers/mtd/nand/raw/cafe_nand.c:372: warning: Function parameter or member 'page' not described in 'cafe_nand_read_page'
 drivers/mtd/nand/raw/cafe_nand.c:372: warning: Excess function parameter 'mtd' description in 'cafe_nand_read_page'

Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Cc: Boris Brezillon <boris.brezillon@collabora.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: linux-mtd@lists.infradead.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20201109182206.3037326-17-lee.jones@linaro.org