[legal] Add FILE_LICENCE macro to some GPL-v2-or-later files

Changes were made to files where the licence text within the files
themselves confirms that the files are GPL version 2 or later.

Signed-off-by: Shao Miller <shao.miller@yrdsb.edu.on.ca>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/bus/virtio-ring.c

@@ -14,6 +14,8 @@
  *
  */
 
+FILE_LICENCE ( GPL2_OR_LATER );
+
 #include "etherboot.h"
 #include "ipxe/io.h"
 #include "ipxe/virtio-ring.h"

src/drivers/net/atl1e.h

@@ -22,6 +22,8 @@
  * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  */
 
+FILE_LICENCE ( GPL2_OR_LATER );
+
 #ifndef _ATL1E_H_
 #define _ATL1E_H_
 

src/drivers/net/via-velocity.c

@@ -38,6 +38,8 @@
 *    Indent Options: indent -kr -i8
 *************************************************************************/
 
+FILE_LICENCE ( GPL2_OR_LATER );
+
 #include "etherboot.h"
 #include "nic.h"
 #include <ipxe/pci.h>

src/drivers/net/via-velocity.h

@@ -24,6 +24,8 @@
  *       Copyright (c) 2006 by Timothy Legge <tlegge@rogers.com>
  */
 
+FILE_LICENCE ( GPL2_OR_LATER );
+
 #ifndef VELOCITY_H
 #define VELOCITY_H