arm64: dts: freescale: tqma9352: Fix watchdog reset

On the tqma9352 the board is reset through an external PMIC, so
set the fsl,ext-reset-output property to enable triggering the
output pin on a watchdog trigger.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx93-tqma9352.dtsi

@@ -156,6 +156,7 @@ &usdhc1 {
 &wdog3 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_wdog>;
+	fsl,ext-reset-output;
 	status = "okay";
 };