arm64: dts: imx8qxp-mek: enable 8qxp lpuart2 and lpuart3

Enable uart2 and uart3 for imx8qxp-mek board.
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8qxp-mek.dts

@@ -187,6 +187,18 @@ &lpuart0 {
 	status = "okay";
 };
 
+&lpuart2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_lpuart2>;
+	status = "okay";
+};
+
+&lpuart3 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_lpuart3>;
+	status = "okay";
+};
+
 &mu_m0 {
 	status = "okay";
 };
@@ -340,6 +352,20 @@ IMX8QXP_UART0_TX_ADMA_UART0_TX				0x06000020
 		>;
 	};
 
+	pinctrl_lpuart2: lpuart2grp {
+		fsl,pins = <
+			IMX8QXP_UART2_TX_ADMA_UART2_TX          0x06000020
+			IMX8QXP_UART2_RX_ADMA_UART2_RX          0x06000020
+		>;
+	};
+
+	pinctrl_lpuart3: lpuart3grp {
+		fsl,pins = <
+			IMX8QXP_FLEXCAN2_TX_ADMA_UART3_TX       0x06000020
+			IMX8QXP_FLEXCAN2_RX_ADMA_UART3_RX       0x06000020
+		>;
+	};
+
 	pinctrl_typec: typecgrp {
 		fsl,pins = <
 			IMX8QXP_SPI2_SCK_LSIO_GPIO1_IO03                        0x06000021