Check DMA descriptors and buffers addresses

[bjoernQ]

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Pull Request Details 📖

Description

Fixes #954

This adds a check for the descriptors and buffers which need to be located in RAM (see #954 (comment))

Some (two) of our currently supported chips can support DMA buffers to be located in extmem but there are a lot of requirements to make that work - if we ever consider it's worth to support it, we can change that but for now this fixes an existing pitfall

Testing

I added a test-case for this. With this, now the lcd_i8080 example will fail at runtime - that's a problem of the example, not this check.

If we think we should fix the example here, I can do - but I can't test it.

[MabezDev]

Excellent, thank you. I appreciate the test cases too!

LGTM!

[JurajSadel]

LGTM, thanks!