stm32/dma: Fix duplicate typedef of struct, it's typedef'd in dma.h.
stm32/dma: Fix duplicate typedef of struct, it's typedef'd in dma.h.

tobbad/micropython,tralamazza/micropython,bvernoux/micropython,dmazzella/micropython,pfalcon/micropython,tralamazza/micropython,MrSurly/micropython,kerneltask/micropython,selste/micropython,trezor/micropython,selste/micropython,henriknelson/micropython,pozetroninc/micropython,adafruit/circuitpython,swegener/micropython,kerneltask/micropython,selste/micropython,tobbad/micropython,tralamazza/micropython,swegener/micropython,pozetroninc/micropython,pramasoul/micropython,ryannathans/micropython,pozetroninc/micropython,MrSurly/micropython,kerneltask/micropython,pfalcon/micropython,pozetroninc/micropython,tobbad/micropython,adafruit/micropython,swegener/micropython,adafruit/circuitpython,selste/micropython,bvernoux/micropython,adafruit/circuitpython,dmazzella/micropython,trezor/micropython,kerneltask/micropython,tralamazza/micropython,ryannathans/micropython,adafruit/micropython,ryannathans/micropython,adafruit/micropython,dmazzella/micropython,ryannathans/micropython,MrSurly/micropython,pramasoul/micropython,bvernoux/micropython,adafruit/circuitpython,pfalcon/micropython,selste/micropython,MrSurly/micropython,bvernoux/micropython,pramasoul/micropython,pramasoul/micropython,henriknelson/micropython,adafruit/micropython,dmazzella/micropython,tobbad/micropython,henriknelson/micropython,ryannathans/micropython,trezor/micropython,henriknelson/micropython,adafruit/micropython,bvernoux/micropython,swegener/micropython,henriknelson/micropython,pozetroninc/micropython,pfalcon/micropython,kerneltask/micropython,tobbad/micropython,MrSurly/micropython,adafruit/circuitpython,trezor/micropython,swegener/micropython,pramasoul/micropython,trezor/micropython,pfalcon/micropython,adafruit/circuitpython