arm64: dts: ti: verdin-am62: Set VDD CORE minimum voltage to 0.75V

Set VDD_CORE minimum voltage to 0.75V, TI AM62 can run at either 0.75V
or 0.85V depending on the actual speed grade and on the maximum
configured speed (1.4GHz frequency requires 0.85V).

The actual value is programmed into the PMIC EEPROM during manufacturing
(according to the SOC speed grade) and this ensure that both the voltage
values are valid and therefore the OS will not overwrite the value
programmed into the PMIC.
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Link: https://lore.kernel.org/r/20240213155622.18309-1-francesco@dolcini.itSigned-off-by: Vignesh Raghavendra <vigneshr@ti.com>

arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi

@@ -1146,7 +1146,7 @@ reg_vdd_core: buck1 {
 				regulator-always-on;
 				regulator-boot-on;
 				regulator-max-microvolt = <850000>;
-				regulator-min-microvolt = <850000>;
+				regulator-min-microvolt = <750000>;
 				regulator-name = "+VDD_CORE (PMIC BUCK1)";
 			};