arm64: dts: librem5: enable the SNVS power key

Enable the snvs power key.
Signed-off-by: Angus Ainslie (Purism) <angus@akkea.ca>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts

@@ -715,6 +715,9 @@ &pwm1 {
 	status = "okay";
 };
 
+&snvs_pwrkey {
+	status = "okay";
+};
 
 &uart1 { /* console */
 	pinctrl-names = "default";