arm: dts: dm8x: Update devicetree header comments to sync with v6.3-rc6

Signed-off-by: Andrew Davis <afd@ti.com>
diff --git a/arch/arm/dts/da850-lcdk.dts b/arch/arm/dts/da850-lcdk.dts
index db8ae56..9c8e9f0 100644
--- a/arch/arm/dts/da850-lcdk.dts
+++ b/arch/arm/dts/da850-lcdk.dts
@@ -1,7 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2016 BayLibre, Inc.
- *
- * Licensed under GPLv2.
  */
 /dts-v1/;
 #include "da850.dtsi"