s390/dasd: fix kernel doc comment

Fix this:

drivers/s390/block/dasd_ioctl.c:666: warning:
 Function parameter or member 'disk' not described in 'dasd_biodasdinfo'
drivers/s390/block/dasd_ioctl.c:666: warning:
 Function parameter or member 'info' not described in 'dasd_biodasdinfo'

Acked-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Link: https://lore.kernel.org/r/20211020115124.1735254-3-sth@linux.ibm.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>