scsi: fnic: Rename wq_copy to hw_copy_wq

scsi: fnic: Rename wq_copy to hw_copy_wq

Rename wq_copy to hw_copy_wq to accurately describe the copy
workqueue. This will also help distinguish this data structure from
software data structures that can be introduced.

Reviewed-by: Sesidhar Baddela <sebaddel@cisco.com>
Reviewed-by: Arulprabhu Ponnusamy <arulponn@cisco.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Karan Tilak Kumar <kartilak@cisco.com>
Link: https://lore.kernel.org/r/20231211173617.932990-5-kartilak@cisco.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>