ata: pata_opti: Fix spelling issue of 'val' in 'opti_write_reg()'

ata: pata_opti: Fix spelling issue of 'val' in 'opti_write_reg()'

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

 drivers/ata/pata_opti.c:82: warning: Function parameter or member 'val' not described in 'opti_write_reg'
 drivers/ata/pata_opti.c:82: warning: Excess function parameter 'value' description in 'opti_write_reg'

Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jaromir Koutek <miri@punknet.cz>
Cc: Jan Harkes <jaharkes@cwi.nl>
Cc: Mark Lord <mlord@pobox.com>
Cc: linux-ide@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210318085150.3131936-10-lee.jones@linaro.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>