Add stop_transfer method to DMA driver

[Dominaezzz]

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Submission Checklist 📝

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Pull Request Details 📖

Description

Adds a stop transfer method to the DMA driver.
I added one in #2191 but I need it for another PR, so I'm sending it in earlier.

This method is internal, so no changelog.

Testing

It's a straight forward change already tested in #2191 and doesn't affect any existing code.

[bugadani]

Yeah I guess this is a bit more polite than resetting the whole thing :D I'll try and use this is the other stuff, thank you!

[SergioGasquez]

LGTM! Thanks