scsi: target: iscsi: Remove the unused netif_timeout attribute

This attribute has never been used, remove it.

Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
Link: https://lore.kernel.org/r/20230630155309.46061-1-mlombard@redhat.com


Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>