arm64: dts: imx8mm: fix voltage for 1.6GHz CPU operating point

The datasheet for both the industrial and consumer variant of the
SoC lists a typical voltage of 0.95V for the 1.6GHz CPU operating
point.

Fixes: e85c9d0f (arm64: dts: imx8mm: Add cpufreq properties)
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mm.dtsi

@@ -129,7 +129,7 @@ opp-1200000000 {
 
 		opp-1600000000 {
 			opp-hz = /bits/ 64 <1600000000>;
-			opp-microvolt = <900000>;
+			opp-microvolt = <950000>;
 			opp-supported-hw = <0xc>, <0x7>;
 			clock-latency-ns = <150000>;
 			opp-suspend;