arm64: dts: imx8mp-evk: Add i2c3 support

Enable i2c3 for i.MX8MP EVK board.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mp-evk.dts

@@ -66,6 +66,13 @@ ethphy1: ethernet-phy@1 {
 	};
 };
 
+&i2c3 {
+	clock-frequency = <400000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_i2c3>;
+	status = "okay";
+};
+
 &snvs_pwrkey {
 	status = "okay";
 };
@@ -138,6 +145,13 @@ MX8MP_IOMUXC_NAND_READY_B__GPIO3_IO16	0x19
 		>;
 	};
 
+	pinctrl_i2c3: i2c3grp {
+		fsl,pins = <
+			MX8MP_IOMUXC_I2C3_SCL__I2C3_SCL		0x400001c3
+			MX8MP_IOMUXC_I2C3_SDA__I2C3_SDA		0x400001c3
+		>;
+	};
+
 	pinctrl_reg_usdhc2_vmmc: regusdhc2vmmc {
 		fsl,pins = <
 			MX8MP_IOMUXC_SD2_RESET_B__GPIO2_IO19	0x41