Add LGPL-2.1+ SPDX-License-Identifier to source files

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/examples/standalone/ppc_longjmp.S b/examples/standalone/ppc_longjmp.S
index 5ca6f6f..bf01daa 100644
--- a/examples/standalone/ppc_longjmp.S
+++ b/examples/standalone/ppc_longjmp.S
@@ -2,20 +2,8 @@
    Copyright (C) 1995, 1996, 1997, 1999, 2000 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C 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
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, write to the Free
-   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-   02111-1307 USA.  */
+ * SPDX-License-Identifier:	LGPL-2.1+
+ */
 
 #include <ppc_asm.tmpl>