scsi: be2iscsi: Set WRB invalid bit for SkyHawk

invalid bit in WRB indicates to FW that IO was invalidated before WRB
was fetched from host memory.

For SkyHawk, this invalid bit in WRB is at a different offset.
Use amap_iscsi_wrb_v2 to mark invalid bit for SkyHawk.

Signed-off-by: Jitendra Bhivare <jitendra.bhivare@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>