ARM: dts: am574x-idk: Add initial support

Add initial dts support for am574x-idk

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/arch/arm/dts/am57xx-commercial-grade.dtsi b/arch/arm/dts/am57xx-commercial-grade.dtsi
index c183654..3eed6e0 100644
--- a/arch/arm/dts/am57xx-commercial-grade.dtsi
+++ b/arch/arm/dts/am57xx-commercial-grade.dtsi
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 &cpu_alert0 {
 	temperature = <80000>; /* milliCelsius */
 };