LL_PWR_GetRegulVoltageScaling() function

Returned value can be one of the following values: @arg LL_PWR_REGU_VOLTAGE_SCALE1 (*) @arg LL_PWR_REGU_VOLTAGE_SCALE2 @arg LL_PWR_REGU_VOLTAGE_SCALE3 (*) LL_PWR_REGU_VOLTAGE_SCALE1 is not available for STM32F401xx devices