Add LGPL-2.0+ SPDX-License-Identifier to source files

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/tools/os_support.h b/tools/os_support.h
index 5bf7add..695ffcf 100644
--- a/tools/os_support.h
+++ b/tools/os_support.h
@@ -1,19 +1,7 @@
 /*
  * Copyright 2009 Extreme Engineering Solutions, Inc.
  *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this software; if not, write to the
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * SPDX-License-Identifier:	LGPL-2.0+
  */
 
 #ifndef __OS_SUPPORT_H_