lpfc: Remove global lpfc_enable_npiv attribute in leiu of per-hba lpfc_enable_npiv

Remove global lpfc_enable_npiv attribute in leiu of per-hba lpfc_enable_npiv

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>