arm64: zynqmp: Sync up license with mainline kernel

Mainline Linux kernel has adopted SPDX header license in a different
format then was used before. This patch is syncing it up.

Also update years in License text and remove Nathalie's email because it
is no longer valid.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/dts/zynqmp-clk-ccf.dtsi

@@ -1,11 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Clock specification for Xilinx ZynqMP
  *
  * (C) Copyright 2017, Xilinx, Inc.
  *
  * Michal Simek <michal.simek@xilinx.com>
- *
- * SPDX-License-Identifier:     GPL-2.0+
  */
 
 / {

arch/arm/dts/zynqmp-clk.dtsi

@@ -1,11 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Clock specification for Xilinx ZynqMP
  *
- * (C) Copyright 2015, Xilinx, Inc.
+ * (C) Copyright 2015 - 2018, Xilinx, Inc.
  *
  * Michal Simek <michal.simek@xilinx.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 / {

arch/arm/dts/zynqmp-zc1751-xm015-dc1.dts

@@ -1,11 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * dts file for Xilinx ZynqMP zc1751-xm015-dc1
  *
- * (C) Copyright 2015, Xilinx, Inc.
+ * (C) Copyright 2015 - 2018, Xilinx, Inc.
  *
  * Michal Simek <michal.simek@xilinx.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 /dts-v1/;

arch/arm/dts/zynqmp-zc1751-xm016-dc2.dts

@@ -1,11 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * dts file for Xilinx ZynqMP zc1751-xm016-dc2
  *
- * (C) Copyright 2015, Xilinx, Inc.
+ * (C) Copyright 2015 - 2018, Xilinx, Inc.
  *
  * Michal Simek <michal.simek@xilinx.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 /dts-v1/;

arch/arm/dts/zynqmp-zc1751-xm018-dc4.dts

@@ -1,11 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * dts file for Xilinx ZynqMP zc1751-xm018-dc4
  *
- * (C) Copyright 2015 - 2016, Xilinx, Inc.
+ * (C) Copyright 2015 - 2018, Xilinx, Inc.
  *
  * Michal Simek <michal.simek@xilinx.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 /dts-v1/;

arch/arm/dts/zynqmp-zc1751-xm019-dc5.dts

@@ -1,12 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * dts file for Xilinx ZynqMP zc1751-xm019-dc5
  *
- * (C) Copyright 2015, Xilinx, Inc.
+ * (C) Copyright 2015 - 2018, Xilinx, Inc.
  *
  * Siva Durga Prasad <siva.durga.paladugu@xilinx.com>
  * Michal Simek <michal.simek@xilinx.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 /dts-v1/;

arch/arm/dts/zynqmp-zcu102-rev1.0.dts

@@ -1,11 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * dts file for Xilinx ZynqMP ZCU102 Rev1.0
  *
- * (C) Copyright 2016, Xilinx, Inc.
+ * (C) Copyright 2016 - 2018, Xilinx, Inc.
  *
  * Michal Simek <michal.simek@xilinx.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include "zynqmp-zcu102-revB.dts"

arch/arm/dts/zynqmp-zcu102-revA.dts

@@ -1,11 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * dts file for Xilinx ZynqMP ZCU102 RevA
  *
- * (C) Copyright 2015, Xilinx, Inc.
+ * (C) Copyright 2015 - 2018, Xilinx, Inc.
  *
  * Michal Simek <michal.simek@xilinx.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 /dts-v1/;

arch/arm/dts/zynqmp-zcu102-revB.dts

@@ -1,11 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * dts file for Xilinx ZynqMP ZCU102 RevB
  *
- * (C) Copyright 2016, Xilinx, Inc.
+ * (C) Copyright 2016 - 2018, Xilinx, Inc.
  *
  * Michal Simek <michal.simek@xilinx.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include "zynqmp-zcu102-revA.dts"

arch/arm/dts/zynqmp.dtsi

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * dts file for Xilinx ZynqMP
  *
@@ -5,7 +6,10 @@
  *
  * Michal Simek <michal.simek@xilinx.com>
  *
- * SPDX-License-Identifier:	GPL-2.0+
+ * 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.
  */
 
 / {