travis: Build PYBD_SF2 board as part of the stm32 job.
travis: Build PYBD_SF2 board as part of the stm32 job.

pozetroninc/micropython,henriknelson/micropython,bvernoux/micropython,adafruit/circuitpython,pramasoul/micropython,tobbad/micropython,henriknelson/micropython,bvernoux/micropython,adafruit/circuitpython,MrSurly/micropython,pfalcon/micropython,adafruit/circuitpython,bvernoux/micropython,pramasoul/micropython,pramasoul/micropython,selste/micropython,pozetroninc/micropython,kerneltask/micropython,kerneltask/micropython,adafruit/circuitpython,MrSurly/micropython,adafruit/circuitpython,adafruit/circuitpython,selste/micropython,trezor/micropython,pozetroninc/micropython,kerneltask/micropython,trezor/micropython,pfalcon/micropython,tobbad/micropython,bvernoux/micropython,bvernoux/micropython,tobbad/micropython,tobbad/micropython,pozetroninc/micropython,pozetroninc/micropython,henriknelson/micropython,trezor/micropython,henriknelson/micropython,selste/micropython,kerneltask/micropython,MrSurly/micropython,MrSurly/micropython,pfalcon/micropython,pramasoul/micropython,pfalcon/micropython,henriknelson/micropython,kerneltask/micropython,selste/micropython,tobbad/micropython,trezor/micropython,MrSurly/micropython,trezor/micropython,pfalcon/micropython,selste/micropython,pramasoul/micropython