arm64: dts: imx8mm-evk: Enable pca6416 on i2c3 bus

Enable pca6416 on i.MX8MM EVK board's i2c3 bus.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mm-evk.dts

@@ -249,6 +249,13 @@ &i2c3 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_i2c3>;
 	status = "okay";
+
+	pca6416: gpio@20 {
+		compatible = "ti,tca6416";
+		reg = <0x20>;
+		gpio-controller;
+		#gpio-cells = <2>;
+	};
 };
 
 &sai3 {