arm64: dts: mediatek: mt8173-elm: Move display to ps8640 auxiliary bus

Move the display to an aux-bus subnode of the PS8640 eDP bridge.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230111140724.294533-1-angelogioacchino.delregno@collabora.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi

@@ -90,18 +90,6 @@
 		};
 	};
 
-	panel: panel {
-		compatible = "lg,lp120up1";
-		power-supply = <&panel_fixed_3v3>;
-		backlight = <&backlight>;
-
-		port {
-			panel_in: endpoint {
-				remote-endpoint = <&ps8640_out>;
-			};
-		};
-	};
-
 	panel_fixed_3v3: regulator1 {
 		compatible = "regulator-fixed";
 		regulator-name = "PANEL_3V3";
@@ -282,6 +270,20 @@
 				};
 			};
 		};
+
+		aux-bus {
+			panel: panel {
+				compatible = "lg,lp120up1";
+				power-supply = <&panel_fixed_3v3>;
+				backlight = <&backlight>;
+
+				port {
+					panel_in: endpoint {
+						remote-endpoint = <&ps8640_out>;
+					};
+				};
+			};
+		};
 	};
 };