scsi: isci: request: Fix doc-rot issue relating to 'ireq' param

scsi: isci: request: Fix doc-rot issue relating to 'ireq' param

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

 drivers/scsi/isci/request.c:496: warning: Function parameter or member 'ireq' not described in 'scu_sata_request_construct_task_context'
 drivers/scsi/isci/request.c:496: warning: Excess function parameter 'sci_req' description in 'scu_sata_request_construct_task_context'

Link: https://lore.kernel.org/r/20210317091230.2912389-28-lee.jones@linaro.org
Cc: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: linux-scsi@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>