ARM: dts: AM437x-SK-EVM: Fix DCDC3 voltage

DCDC3 supplies voltage to DDR. Fix DCDC3 volatge to 1.5V which is the reset
value. Programming to a non-reset value while executing from DDR will result
in random hangs.
Signed-off-by: NKeerthy <j-keerthy@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am437x-sk-evm.dts

@@ -363,8 +363,8 @@ dcdc2: regulator-dcdc2 {
 		dcdc3: regulator-dcdc3 {
 			compatible = "ti,tps65218-dcdc3";
 			regulator-name = "vdds_ddr";
-			regulator-min-microvolt = <1350000>;
-			regulator-max-microvolt = <1350000>;
+			regulator-min-microvolt = <1500000>;
+			regulator-max-microvolt = <1500000>;
 			regulator-boot-on;
 			regulator-always-on;
 		};