arm64: dts: imx8mp-venice-gw74xx-imx219.dtso: fix dt warning

Fix the following warning from a 'make dtbs W=1':
arch/arm64/boot/dts/freescale/imx8mp-venice-gw74xx-imx219.dtso:65.10-70.5:
Warning (unit_address_vs_reg): /fragment@3/__overlay__/ports/port@0:
node has a unit name, but no reg or ranges property
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mp-venice-gw74xx-imx219.dtso

@@ -62,12 +62,25 @@ &mipi_csi_0 {
 	status = "okay";
 
 	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
 		port@0 {
+			reg = <0>;
+
 			mipi_csi_0_in: endpoint {
 				remote-endpoint = <&imx219_to_mipi_csi2>;
 				data-lanes = <1 2>;
 			};
 		};
+
+		port@1 {
+			reg = <1>;
+
+			mipi_csi_0_out: endpoint {
+				remote-endpoint = <&isi_in_0>;
+			};
+		};
 	};
 };