arm64: dts: imx8mm-kontron: Set VDD_SNVS to 800 mV

According to the datasheet VDD_SNVS should be 800 mV, so let's
make sure that the voltage won't be different.

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>

arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi

@@ -152,8 +152,8 @@ reg_nvcc_snvs: LDO1 {
 
 			reg_vdd_snvs: LDO2 {
 				regulator-name = "ldo2";
-				regulator-min-microvolt = <850000>;
-				regulator-max-microvolt = <900000>;
+				regulator-min-microvolt = <800000>;
+				regulator-max-microvolt = <800000>;
 				regulator-boot-on;
 				regulator-always-on;
 			};