stm32/timer: Properly initialise timer deadtime/brk on WB MCUs.
stm32/timer: Properly initialise timer deadtime/brk on WB MCUs.

Signed-off-by: Damien George <99e6b749acbfbe2a596df99e91d24d6e1fdbee00@micropython.org>

henriknelson/micropython,pramasoul/micropython,kerneltask/micropython,MrSurly/micropython,adafruit/circuitpython,MrSurly/micropython,selste/micropython,bvernoux/micropython,selste/micropython,kerneltask/micropython,adafruit/circuitpython,adafruit/circuitpython,pramasoul/micropython,henriknelson/micropython,bvernoux/micropython,bvernoux/micropython,adafruit/circuitpython,selste/micropython,kerneltask/micropython,selste/micropython,MrSurly/micropython,adafruit/circuitpython,adafruit/circuitpython,MrSurly/micropython,kerneltask/micropython,henriknelson/micropython,pramasoul/micropython,henriknelson/micropython,bvernoux/micropython,selste/micropython,pramasoul/micropython,bvernoux/micropython,kerneltask/micropython,pramasoul/micropython,henriknelson/micropython,MrSurly/micropython