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/LaCie/net2big_v2/Makefile b/board/LaCie/net2big_v2/Makefile
index 9a6dfb6..ad40231 100644
--- a/board/LaCie/net2big_v2/Makefile
+++ b/board/LaCie/net2big_v2/Makefile
@@ -6,18 +6,7 @@
 # Marvell Semiconductor <www.marvell.com>
 # Written-by: Prafulla Wadaskar <prafulla@marvell.com>
 #
-# 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 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.
+# SPDX-License-Identifier:	GPL-2.0+
 #
 
 include $(TOPDIR)/config.mk