qla2xxx: Enhancements to enable NPIV support for QLOGIC ISPs with TCM/LIO.

Signed-off-by: Sawan Chandak <sawan.chandak@qlogic.com>
Signed-off-by: Quinn Tran <quinn.tran@qlogic.com>
Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>