[riot-notifications] [RIOT-OS/RIOT] Feature/dma functions (#16440)

Sebastiaan de Schaetzen notifications at github.com
Tue May 4 15:57:02 CEST 2021

### Contribution description
This PR adds two additional functions to the STM32 DMA API:
 - `dma_left(dma)` - Gets the number of bytes that still have to be transferred by the DMA controller. This allows retrieving this number without having to suspend and resume the transfer using `dma_suspend` and `dma_resume`.
 - `dma_transfer_callback(dma, callback, arg)` - Allows setting a user-defined callback which gets executed when the Transfer Complete interrupt is fired.
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-- Commit Summary --

  * stm32/dma: add dma_left function
  * stm32/dma: add ability to call function on DMA Transfer Complete IRQ

-- File Changes --

    M cpu/stm32/include/periph_cpu.h (18)
    M cpu/stm32/periph/dma.c (23)

-- Patch Links --


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