arm: zynq: Update years in copyright to reflect latest changes

Updating year in zynq files. Also add missing Copyright to board.c.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm/mach-zynq/ddrc.c b/arch/arm/mach-zynq/ddrc.c
index bde52d6..047a7b4 100644
--- a/arch/arm/mach-zynq/ddrc.c
+++ b/arch/arm/mach-zynq/ddrc.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) 2012 - 2013 Michal Simek <monstr@monstr.eu>
- * Copyright (C) 2012 - 2013 Xilinx, Inc. All rights reserved.
+ * Copyright (C) 2012 - 2017 Xilinx, Inc. All rights reserved.
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */