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/fs/reiserfs/reiserfs.c b/fs/reiserfs/reiserfs.c
index efab8fa..1d6fa08 100644
--- a/fs/reiserfs/reiserfs.c
+++ b/fs/reiserfs/reiserfs.c
@@ -8,19 +8,7 @@
  *  Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
  *
  *
- *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 /* An implementation for the ReiserFS filesystem ported from GRUB.