scsi: ibmvfc: Advertise client support for targetWWPN using v2 commands

The previous patch added support for the targetWWPN field in version 2 MADs
and vfcFrame structures.

Set the IBMVFC_CAN_SEND_VF_WWPN bit in our capabailites flag during NPIV
Login to inform the VIOS that this client supports the feature.

Link: https://lore.kernel.org/r/20201118011104.296999-7-tyreld@linux.ibm.com


Acked-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>