scsi: target: remove hardcoded T10 Vendor ID in INQUIRY response

Use the value stored in t10_wwn.vendor, which defaults to "LIO-ORG", but
can be reconfigured via the vendor_id ConfigFS attribute.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Bryant G. Ly <bly@catalogicsoftware.com>
Reviewed-by: Lee Duncan <lduncan@suse.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Roman Bolshakov <r.bolshakov@yadro.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>