[Intel-gfx] add remap_pfn_range_notrack instead of reinventing it in i915 v2

[Christoph Hellwig]

On Thu, Apr 08, 2021 at 12:36:21PM +0200, Daniel Vetter wrote:
> I've seen it's landed already in some tree, maybe if you can add the acks
> ftr?

Andrew has picked it up in -mm.