ARM: dts: vf610-colibri: use of_graph dt nodes to describe the panel

The fsl,panel property is deprecated and we should use the new
of_graph dt bindings to describe the relationship between the DCU
controller and the panel.
Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/vf-colibri-eval-v3.dtsi

@@ -53,6 +53,12 @@ clk16m: clk16m {
 	panel: panel {
 		compatible = "edt,et057090dhu";
 		backlight = <&bl>;
+
+		port {
+			panel_in: endpoint {
+				remote-endpoint = <&dcu_out>;
+			};
+		};
 	};
 
 	reg_3v3: regulator-3v3 {
@@ -91,8 +97,13 @@ &bl {
 &dcu0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_dcu0_1>;
-	fsl,panel = <&panel>;
 	status = "okay";
+
+	port {
+		dcu_out: endpoint {
+			remote-endpoint = <&panel_in>;
+		};
+	};
 };
 
 &dspi1 {