Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/arm/boot/dts/imx6dl-apf6dev.dts b/arch/arm/boot/dts/imx6dl-apf6dev.dts
index 4a7f86d..6632e99 100644
--- a/arch/arm/boot/dts/imx6dl-apf6dev.dts
+++ b/arch/arm/boot/dts/imx6dl-apf6dev.dts
@@ -55,6 +55,7 @@
 	compatible = "armadeus,imx6dl-apf6dev", "armadeus,imx6dl-apf6", "fsl,imx6dl";
 
 	memory@10000000 {
+		device_type = "memory";
 		reg = <0x10000000 0x20000000>;
 	};
 };