scsi: libfc: Stop using the SCSI pointer

Move the fc_fcp_pkt pointer, the residual length and the SCSI status into
the new data structure libfc_cmd_priv. This patch prepares for removal of
the SCSI pointer from struct scsi_cmnd.

The user of the libfc data path functions have been identified as follows:
$ git grep -lw fc_queuecommand | grep -v scsi/libfc/
drivers/scsi/fcoe/fcoe.c

Link: https://lore.kernel.org/r/20220218195117.25689-28-bvanassche@acm.org


Cc: Saurav Kashyap <skashyap@marvell.com>
Cc: Javed Hasan <jhasan@marvell.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>