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/cpld.h b/board/freescale/c29xpcie/cpld.h
index 24093c4..20862a3 100644
--- a/board/freescale/c29xpcie/cpld.h
+++ b/board/freescale/c29xpcie/cpld.h
@@ -3,10 +3,7 @@
  * Author: Mingkai Hu <Mingkai.Hu@freescale.com>
  *         Po Liu <Po.Liu@freescale.com>
  *
- * 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+
  *
  * This file provides support for the ngPIXIS, a board-specific FPGA used on
  * some Freescale reference boards.