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/slcr.c b/arch/arm/mach-zynq/slcr.c
index ba453a7..0b263fa 100644
--- a/arch/arm/mach-zynq/slcr.c
+++ b/arch/arm/mach-zynq/slcr.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013 Xilinx Inc.
+ * Copyright (c) 2013 - 2017 Xilinx Inc.
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */