ARM: dts: imx7-mba7: configure watchdog

The external watchdog reset is necessary, as the internal reset is
unreliable on i.MX7.
Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx7-mba7.dtsi

@@ -467,6 +467,12 @@ MX7D_PAD_LPSR_GPIO1_IO04__USB_OTG1_OC	0x5c
 			MX7D_PAD_LPSR_GPIO1_IO05__GPIO1_IO5	0x59
 		>;
 	};
+
+	pinctrl_wdog1: wdog1grp {
+		fsl,pins = <
+			MX7D_PAD_LPSR_GPIO1_IO00__WDOG1_WDOG_B	0x30
+		>;
+	};
 };
 
 &pwm1 {
@@ -543,3 +549,9 @@ &usdhc1 {
 	no-1-8-v;
 	status = "okay";
 };
+
+&wdog1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_wdog1>;
+	fsl,ext-reset-output;
+};