powerpc/mpc85xx: Cleanup license header in source files

Fix the license header introduced by the following patches

Add TWR-P10xx board support
Add T4240EMU target
IDT8T49N222A configuration code
Add C29x SoC support
Add support for C29XPCIE board

Signed-off-by: York Sun <yorksun@freescale.com>
diff --git a/board/freescale/c29xpcie/Makefile b/board/freescale/c29xpcie/Makefile
index 15bef9a..ab8eb8f 100644
--- a/board/freescale/c29xpcie/Makefile
+++ b/board/freescale/c29xpcie/Makefile
@@ -1,11 +1,7 @@
 #
 # Copyright 2013 Freescale Semiconductor, 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 $(TOPDIR)/config.mk