[legal] Add FILE_LICENCE for valgrind headers

Signed-off-by: Marin Hannache <git@mareo.fr>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/arch/x86/include/valgrind/memcheck.h

 #ifndef __MEMCHECK_H
 #define __MEMCHECK_H
 
+FILE_LICENCE ( BSD3 );
+
 
 /* This file is for inclusion into client (your!) code.
 

src/arch/x86/include/valgrind/valgrind.h

 #ifndef __VALGRIND_H
 #define __VALGRIND_H
 
+FILE_LICENCE ( BSD3 );
+
 
 /* ------------------------------------------------------------------ */
 /* VERSION NUMBER OF VALGRIND                                         */