Prepare for removing the scsi_request structure by moving the resid_len
field to struct scsi_cmnd.

Link: https://lore.kernel.org/r/20220224175552.988286-6-hch@lst.deReviewed-by: NBart Van Assche <bvanassche@acm.org>
Reviewed-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>