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/drivers/net/cs8900.c b/drivers/net/cs8900.c
index 6aaa0cf..84963c1 100644
--- a/drivers/net/cs8900.c
+++ b/drivers/net/cs8900.c
@@ -14,9 +14,6 @@
  *
  * Copyright (C) 1999 Ben Williamson <benw@pobox.com>
  *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
  * This program is loaded into SRAM in bootstrap mode, where it waits
  * for commands on UART1 to read and write memory, jump to code etc.
  * A design goal for this program is to be entirely independent of the
@@ -24,19 +21,7 @@
  * this code in bootstrap mode.  All the board specifics can be handled on
  * the host.
  *
- * 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+
  */
 
 #include <common.h>