Merge pull request #10689 from aabadie/pr/boards/st_adc_numof_cleanup

boards/b-l072z-lrwan1/include/periph_conf.h

boards/b-l475e-iot01a/include/periph_conf.h

boards/f4vi1/include/periph_conf.h

boards/fox/include/periph_conf.h

boards/maple-mini/include/periph_conf.h

boards/nucleo-f103rb/include/periph_conf.h

boards/nucleo-f302r8/include/periph_conf.h

boards/nucleo-f722ze/include/periph_conf.h

boards/nucleo-f746zg/include/periph_conf.h

boards/nucleo-f767zi/include/periph_conf.h

boards/nucleo-l053r8/include/periph_conf.h

boards/nucleo-l433rc/include/periph_conf.h

boards/nucleo-l452re/include/periph_conf.h

boards/opencm904/include/periph_conf.h

boards/spark-core/include/periph_conf.h

boards/stm32f769i-disco/include/periph_conf.h

boards/stm32l476g-disco/include/periph_conf.h