cpu/stm32/periph/adc_f1: removes ADC configuration loading
cpu/stm32/periph/adc_f1: removes ADC configuration loading

ant9000/RIOT,OlegHahm/RIOT,miri64/RIOT,miri64/RIOT,miri64/RIOT,kaspar030/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,jasonatran/RIOT,kaspar030/RIOT,ant9000/RIOT,kYc0o/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,kYc0o/RIOT,kYc0o/RIOT,OlegHahm/RIOT,authmillenon/RIOT,kYc0o/RIOT,kaspar030/RIOT,authmillenon/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,authmillenon/RIOT,jasonatran/RIOT,miri64/RIOT,kaspar030/RIOT,authmillenon/RIOT,ant9000/RIOT,ant9000/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,miri64/RIOT,ant9000/RIOT,kYc0o/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,jasonatran/RIOT,authmillenon/RIOT