arm: dts: imx6ulz-bsh-smm-m2: Fix reset using wdt-reboot driver

commit 68dcbdd594d4 ("ARM: imx: Add weak default reset_cpu()")
introduced a regression that 'reset' command unable to reset
imx6ulz based BSH module's modules in the u-boot.

BSH module's imx6, imx6ulz-bsh-smm-m2.dts

Fixes: 68dcbdd594d4 ("ARM: imx: Add weak default reset_cpu()")
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
diff --git a/arch/arm/dts/imx6ulz-bsh-smm-m2-u-boot.dtsi b/arch/arm/dts/imx6ulz-bsh-smm-m2-u-boot.dtsi
index c676228..faf5962 100644
--- a/arch/arm/dts/imx6ulz-bsh-smm-m2-u-boot.dtsi
+++ b/arch/arm/dts/imx6ulz-bsh-smm-m2-u-boot.dtsi
@@ -5,6 +5,14 @@
  * Author: Michael Trimarchi <michael@amarulasolutions.com>
  */
 
+/ {
+	wdt-reboot {
+		compatible = "wdt-reboot";
+		wdt = <&wdog1>;
+		bootph-pre-ram;
+	};
+};
+
 &aips2 {
 	bootph-all;
 };