instruct firmware to use driver/iscsid provided expected statsn field
while constructing login pdu header.

Initialize 'flags' to instruct chip to use driver/iscsid provided
ExpStatSN value while constructing iSCSI login PDU header
Signed-off-by: NEddie Wai <waie@broadcom.com>
Signed-off-by: NAnil Veerabhadrappa <anilgv@broadcom.com>
Reviewed-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>