fix: wrong timer source in G0xx controllers #1
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This PR fixes the wrong returned timer source in STM32G0xx MCUs. The G0xx controllers also have only PCLK1 (like the F0 familiy), so the function should always return 1 in this case. Otherwise, e.g. if TIM1 in combination with PWM is used, 2 is returned which will crash the function HardwareTimer::getTimerClkFreq because of an unexpected timer source.