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/spl.c b/arch/arm/mach-zynq/spl.c
index 1672fa0..b7e6d98 100644
--- a/arch/arm/mach-zynq/spl.c
+++ b/arch/arm/mach-zynq/spl.c
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright 2014 Xilinx, Inc. Michal Simek
+ * (C) Copyright 2014 - 2017 Xilinx, Inc. Michal Simek
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */