drivers: clock_control: stm32: adding config_regulator_voltage for L0 #73011
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STM32 MCU shall set voltage regulator level with respect to set clock frequency to reach optimal power consumption.
Voltage regulator is set prior to clock setting based on configuration from dts/overlay file. Config_regulator_voltage is set as weak in clock_stm32_ll_common - config_regulator_voltage can be extended to other STM32 families without need to rewrite heavily family clock driver, default one can be still used.