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/mpc824x/pci.c b/arch/powerpc/cpu/mpc824x/pci.c
index 72aaec7..1257b08 100644
--- a/arch/powerpc/cpu/mpc824x/pci.c
+++ b/arch/powerpc/cpu/mpc824x/pci.c
@@ -9,10 +9,7 @@
  *
  * Copyright 2001 MontaVista Software Inc.
  *
- * 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.
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>