[Baudrate] Set baudrate to 115200 for all boards

...texM0_stm32/stm32f072rb_stm32f0discovery/board_settings.h

...ch/cortexM3_stm32/stm32f100c8_microboard/board_settings.h

.../cortexM3_stm32/stm32f100c8_vaisala_rs41/board_settings.h

...ch/cortexM3_stm32/stm32f100cb_tempsensor/board_settings.h

.../arch/cortexM3_stm32/stm32f100cx_generic/board_settings.h

...texM3_stm32/stm32f100rb_stm32vldiscovery/board_settings.h

.../cortexM3_stm32/stm32f100rc_solertegiard/board_settings.h

...arch/cortexM3_stm32/stm32f103c8_breakout/board_settings.h

...texM3_stm32/stm32f103c8_skyward_alderaan/board_settings.h

...xM3_stm32/stm32f103cb_als_mainboard_rev2/board_settings.h

...3_stm32/stm32f103cb_skyward_strain_board/board_settings.h

.../arch/cortexM3_stm32/stm32f103cx_generic/board_settings.h

...ig/arch/cortexM3_stm32/stm32f103ve_mp3v2/board_settings.h

...h/cortexM3_stm32/stm32f103ve_strive_mini/board_settings.h

...ch/cortexM3_stm32/stm32f103ze_redbull_v2/board_settings.h

...cortexM3_stm32/stm32f103ze_stm3210e-eval/board_settings.h

.../arch/cortexM3_stm32f2/stm32f205_generic/board_settings.h

...stm32f2/stm32f205rc_skyward_stormtrooper/board_settings.h

...rtexM3_stm32f2/stm32f207ig_stm3220g-eval/board_settings.h

...ortexM3_stm32f2/stm32f207ze_als_camboard/board_settings.h