mtd: onenand: onenand_base: Fix expected kernel-doc formatting

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

 drivers/mtd/nand/onenand/onenand_base.c:140: warning: Function parameter or member 'mtd' not described in 'onenand_ooblayout_32_64_ecc'
 drivers/mtd/nand/onenand/onenand_base.c:140: warning: Function parameter or member 'section' not described in 'onenand_ooblayout_32_64_ecc'
 drivers/mtd/nand/onenand/onenand_base.c:140: warning: Function parameter or member 'oobregion' not described in 'onenand_ooblayout_32_64_ecc'
 drivers/mtd/nand/onenand/onenand_base.c:200: warning: Function parameter or member 'addr' not described in 'onenand_readw'
 drivers/mtd/nand/onenand/onenand_base.c:212: warning: Function parameter or member 'value' not described in 'onenand_writew'
 drivers/mtd/nand/onenand/onenand_base.c:212: warning: Function parameter or member 'addr' not described in 'onenand_writew'
 drivers/mtd/nand/onenand/onenand_base.c:225: warning: Function parameter or member 'this' not described in 'onenand_block_address'
 drivers/mtd/nand/onenand/onenand_base.c:225: warning: Function parameter or member 'block' not described in 'onenand_block_address'
 drivers/mtd/nand/onenand/onenand_base.c:242: warning: Function parameter or member 'this' not described in 'onenand_bufferram_address'
 drivers/mtd/nand/onenand/onenand_base.c:242: warning: Function parameter or member 'block' not described in 'onenand_bufferram_address'

 NB: Snipped 200 lines for brevity.

Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Cc: Adrian Hunter <ext-adrian.hunter@nokia.com>
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/20201109182206.3037326-4-lee.jones@linaro.org