[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/crypto/axtls/aes.c

@@ -16,6 +16,8 @@
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+FILE_LICENCE ( GPL2_OR_LATER );
+
 /**
  * AES implementation - this is a small code version. There are much faster
  * versions around but they are much larger in size (i.e. they use large 

src/crypto/axtls/bigint.h

@@ -16,6 +16,8 @@
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+FILE_LICENCE ( GPL2_OR_LATER );
+
 #ifndef BIGINT_HEADER
 #define BIGINT_HEADER
 

src/crypto/axtls/crypto.h

@@ -16,6 +16,8 @@
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+FILE_LICENCE ( GPL2_OR_LATER );
+
 /**
  * @file crypto.h
  */