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

Signed-off-by: Wolfgang Denk <wd@denx.de>
[trini: Fixup common/cmd_io.c]
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/board/LEOX/elpt860/u-boot.lds.debug b/board/LEOX/elpt860/u-boot.lds.debug
index 592d9e3..ce81046 100644
--- a/board/LEOX/elpt860/u-boot.lds.debug
+++ b/board/LEOX/elpt860/u-boot.lds.debug
@@ -12,20 +12,7 @@
 **
 **=====================================================================
 **
-** This program is free software; you can redistribute it and/or
-** modify it under the terms of the GNU General Public License as
-** published by the Free Software Foundation; either version 2 of
-** the License, or (at your option) any later version.
-**
-** This program 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 General Public License for more details.
-**
-** You should have received a copy of the GNU General Public License
-** along with this program; if not, write to the Free Software
-** Foundation, Inc., 59 Temple Place, Suite 330, Boston,
-** MA 02111-1307 USA
+ * SPDX-License-Identifier:	GPL-2.0+
 **
 **=====================================================================
 */