arm64: dts: mediatek: mt8173-elm: Fix dsi0 ports warning

Since only a single port is present, remove the inner `ports`
parent node and just declare the single port as `port`.

Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Author: AngeloGioacchino Del Regno

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

@@ -206,11 +206,9 @@
 
 &dsi0 {
 	status = "okay";
-	ports {
-		port {
-			dsi0_out: endpoint {
-				remote-endpoint = <&ps8640_in>;
-			};
+	port {
+		dsi0_out: endpoint {
+			remote-endpoint = <&ps8640_in>;
 		};
 	};
 };