[Intel-gfx] Allow mdev drivers to directly create the vfio_device (v3)

[Christoph Hellwig]

On Tue, Jun 15, 2021 at 05:35:15PM -0300, Jason Gunthorpe wrote:
> Yes, the rest of the drivers will get converted eventually too. There
> is no reason to hold things back. Depending on timelines we might be
> able to get AP into this cycle too...

And I have a WIP tree to get rid of the weird indirections in i915/gvt.
Once I find some cycles to test that I'll also test the vfio interface
conversion.  This will probably be for next cycle, though.