ARM: zynq: DT: Update years in header

Add this year to the header.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/boot/dts/zynq-zc702.dts

 /*
- *  Copyright (C) 2011 Xilinx
+ *  Copyright (C) 2011 - 2014 Xilinx
  *  Copyright (C) 2012 National Instruments Corp.
  *
  * This software is licensed under the terms of the GNU General Public

arch/arm/boot/dts/zynq-zc706.dts

 /*
- *  Copyright (C) 2011 Xilinx
+ *  Copyright (C) 2011 - 2014 Xilinx
  *  Copyright (C) 2012 National Instruments Corp.
- *  Copyright (C) 2013 Xilinx
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and

arch/arm/boot/dts/zynq-zed.dts

 /*
- *  Copyright (C) 2011 Xilinx
+ *  Copyright (C) 2011 - 2014 Xilinx
  *  Copyright (C) 2012 National Instruments Corp.
- *  Copyright (C) 2013 Xilinx
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and