imx6sll: synchronise device tree with linux

Synchronise device tree with linux v6.0-rc1.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
diff --git a/arch/arm/dts/imx6sll-pinfunc.h b/arch/arm/dts/imx6sll-pinfunc.h
index 5a3700b..713a346 100644
--- a/arch/arm/dts/imx6sll-pinfunc.h
+++ b/arch/arm/dts/imx6sll-pinfunc.h
@@ -1,9 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright 2016 Freescale Semiconductor, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
+ * Copyright 2017-2018 NXP.
  *
  */