[D18][MV][DTBO] Add dummy node for the device config of the MV

The dummy node is parsed in U-Boot to resolve the panel and touch IDs
from the EEPROM device config data-structure.

arch/arm64/boot/dts/seco/overlays/seco-imx8mp-d18-mv-overlay.dts

@@ -178,4 +178,23 @@
 		};
 	};
 
+	fragment@9 {
+		target-path = "/";
+		__overlay__ {
+			seco-device-config {
+				compatible = "seco,devconf";
+				status = "disabled";
+				
+				overlays {
+					panel-id-1 = "seco-imx8mp-d18-lvds-wsvga-qx_070wsvgamml01d.dtbo";
+					panel-id-2 = "seco-imx8mp-d18-lvds-wsvga-fn0700d101a.dtbo";
+					panel-id-3 = "seco-imx8mp-d18-lvds-wxga-g101ean02.dtbo";
+					panel-id-4 = "seco-imx8mp-d18-lvds-fhd-g156han02.dtbo";
+					touch-id-1 = "seco-imx8mp-d18-ts-eeti.dtbo";
+					touch-id-2 = "seco-imx8mp-d18-ts-ilitek.dtbo";
+					touch-id-3 = "seco-imx8mp-d18-ts-mxt.dtbo";
+				};
+			};
+		};
+	};
 };