scsi: iscsi: Merge suspend fields

Move the tx and rx suspend fields into one flags field.

Link: https://lore.kernel.org/r/20220408001314.5014-8-michael.christie@oracle.com


Tested-by: Manish Rangankar <mrangankar@marvell.com>
Reviewed-by: Lee Duncan <lduncan@suse.com>
Reviewed-by: Chris Leech <cleech@redhat.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>