imx7d-sdb-u-boot: Pass SPDX-License tag
SPDX-License tag is missing and checkpatch complains about it.
Add the SPDX-License tag using the same one from imx7d-sdb.dts.
Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Marek Vasut <marex@denx.de>
diff --git a/arch/arm/dts/imx7d-sdb-u-boot.dtsi b/arch/arm/dts/imx7d-sdb-u-boot.dtsi
index e4a27b8..b577730 100644
--- a/arch/arm/dts/imx7d-sdb-u-boot.dtsi
+++ b/arch/arm/dts/imx7d-sdb-u-boot.dtsi
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0+ OR MIT
+
#include "imx7s-u-boot.dtsi"
&fec2 {