Incorrect ADC measurement in STM32L0 low frequency system clock (2MHz)

[dhineshkumarmcci]

On reading the ADC values for Vbat and Vbus, the output values are wrong for 2 MHz with the latest changes in CatenaStn32L0_ReadAnalog.cpp.

Catena-Arduino-Platform/src/lib/stm32/stm32l0/CatenaStm32L0_ReadAnalog.cpp

Line 175 in 75b6710

AdcStart();

With this change, it works good for all other frequencies.