ARM: dts: imx6ulz-bsh-smm-m2: Support proper board power off

Supports initiating poweroff on SNVS_PMIC_ON_REQ signal.

Signed-off-by: Simon Holesch <[e-mail]>
Signed-off-by: Michael Trimarchi <[e-mail]>
Reviewed-by: Fabio Estevam <[e-mail]>
Signed-off-by: Shawn Guo <[e-mail]>

arch/arm/boot/dts/imx6ulz-bsh-smm-m2.dts

···
 	status = "okay";
 };
 
+&snvs_poweroff {
+	status = "okay";
+};
+
 &uart3 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_uart3>;