Deploying new iterator interface for dma-buf

[Christian König]

Hi guys,

The version I've send out yesterday had a rather obvious coding error and I honestly forgot the cover letter.

This one here is better tested and will now hopefully not be torn apart from the CI system immediately.

I tried to address all review and documentation comments as best as I could, so I'm hoping that we can now considering pushing this.

Cheers,
Christian.