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/arch/powerpc/cpu/ppc4xx/ecc.h b/arch/powerpc/cpu/ppc4xx/ecc.h
index b258891..bc94257 100644
--- a/arch/powerpc/cpu/ppc4xx/ecc.h
+++ b/arch/powerpc/cpu/ppc4xx/ecc.h
@@ -5,28 +5,11 @@
  *    Copyright (c) 2007-2009 DENX Software Engineering, GmbH
  *	Stefan Roese <sr@denx.de>
  *
- *    See file CREDITS for list of people who contributed to this
- *    project.
- *
- *    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 abe 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+
  *
  *    Description:
  *	This file implements ECC initialization for PowerPC processors
  *	using the IBM SDRAM DDR1 & DDR2 controller.
- *
  */
 
 #ifndef _ECC_H_