Merge pull request #7477 from OTAkeys/pr/fix_stm32_clk

boards/f4vi1/include/periph_conf.h

boards/msbiot/include/periph_conf.h

boards/nucleo-f401/include/periph_conf.h

boards/nucleo-f410/include/periph_conf.h

boards/nucleo-f411/include/periph_conf.h

boards/nucleo-f446/include/periph_conf.h

boards/nucleo144-f207/include/periph_conf.h

boards/nucleo144-f412/include/periph_conf.h

boards/nucleo144-f413/include/periph_conf.h

boards/nucleo144-f429/include/periph_conf.h

boards/nucleo144-f446/include/periph_conf.h

boards/nucleo144-f722/include/periph_conf.h

boards/nucleo144-f746/include/periph_conf.h

boards/nucleo144-f767/include/periph_conf.h

boards/stm32f4discovery/include/periph_conf.h

boards/stm32f7discovery/include/periph_conf.h

cpu/stm32_common/dist/.gitignore

cpu/stm32_common/dist/clk_conf/Makefile

cpu/stm32_common/dist/clk_conf/clk_conf.c

cpu/stm32_common/dist/clk_conf/clk_conf.h