imx6ul/imx6ull: synchronise device trees with linux

Synchronise device trees with linux v5.19-rc5.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
diff --git a/arch/arm/dts/imx6ul-litesom.dtsi b/arch/arm/dts/imx6ul-litesom.dtsi
index 8f775f6..8d68932 100644
--- a/arch/arm/dts/imx6ul-litesom.dtsi
+++ b/arch/arm/dts/imx6ul-litesom.dtsi
@@ -48,6 +48,7 @@
 	compatible = "grinn,imx6ul-litesom", "fsl,imx6ul";
 
 	memory@80000000 {
+		device_type = "memory";
 		reg = <0x80000000 0x20000000>;
 	};
 };