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19677: boards/nucleo-l432k: provide three periph_timer instances r=maribu a=maribu ### Contribution description - `cpu/stm32/periph_timer`: Generalize to also work with timers that do not have 4 channels - `boards/common/stm32`: Add timer config for three timers based on TIM2, TIM15, and TIM16 (the three general-purpose timers of the STM32L4) - `boards/nucleo-l432kc`: Make use of the new timer config 19683: cpu/sam0_eth: clean up init() r=maribu a=benpicco Co-authored-by: Marian Buschsieweke <marian.buschsieweke@ovgu.de> Co-authored-by: Benjamin Valentin <benjamin.valentin@ml-pa.com>