stm32/timer: Expose the PWM BRK capability of Timer 1 and 8.
stm32/timer: Expose the PWM BRK capability of Timer 1 and 8.

The break mode is configurable via the 'brk' keyword to the Timer
constructor and init method.  It's disabled by default.

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