[riot-notifications] [RIOT-OS/RIOT] boards/stm32f4: Add DMA config for SPI (#14093)

Koen Zandberg notifications at github.com
Wed May 20 16:44:14 CEST 2020

> I just tested `tests/pkg_lvgl` on stm32f429disc1 and it's still working with and without DMA.

This should be fine here. While the ili9341 never reads the received SPI data (it can operate without MISO line), the RX DMA channel is still configured and must have a valid configuration for this to work.

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