ARM: dts: imx6dl-yapp4: Enable UART2

The second UART is needed for 3D or MFD printer control.
Signed-off-by: Michal Vokáč <michal.vokac@ysoft.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6dl-yapp4-common.dtsi

@@ -460,6 +460,13 @@ MX6QDL_PAD_CSI0_DAT11__UART1_RX_DATA	0x1b0a8
 		>;
 	};
 
+	pinctrl_uart2: uart2grp {
+		fsl,pins = <
+			MX6QDL_PAD_GPIO_7__UART2_TX_DATA	0x1b098
+			MX6QDL_PAD_GPIO_8__UART2_RX_DATA	0x1b098
+		>;
+	};
+
 	pinctrl_usbh1: usbh1grp {
 		fsl,pins = <
 			MX6QDL_PAD_EIM_D30__USB_H1_OC	0x1b098
@@ -545,6 +552,12 @@ &uart1 {
 	status = "okay";
 };
 
+&uart2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_uart2>;
+	status = "okay";
+};
+
 &usbh1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_usbh1>;