stm32/dma: Initialise all members of DMA structs for H7 MCUs.
stm32/dma: Initialise all members of DMA structs for H7 MCUs.

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