ARM: dts: am335x-phycore-som: Fix mpu voltage

Fix the mpu voltage as it is set too low for the silicon
revision 2.1.

Signed-off-by: Teresa Remmet <t.remmet@phytec.de>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am335x-phycore-som.dtsi

@@ -252,10 +252,10 @@
 		};
 
 		vdd1_reg: regulator@2 {
-			/* VDD_MPU voltage limits 0.95V - 1.26V with +/-4% tolerance */
+			/* VDD_MPU voltage limits 0.95V - 1.325V with +/-4% tolerance */
 			regulator-name = "vdd_mpu";
 			regulator-min-microvolt = <912500>;
-			regulator-max-microvolt = <1312500>;
+			regulator-max-microvolt = <1378000>;
 			regulator-boot-on;
 			regulator-always-on;
 		};