[PATCH xf86-video-amdgpu] Allow changing DCC parameters between flips

[Michel Dänzer]

Thanks Marek for the patch, but xf86-video-amdgpu patches are being
reviewed as GitLab merge requests since the last release[0].

I'll create a merge request with this patch and some follow-up changes.


[0] Isn't README.md clear enough on this?

-- 
Earthling Michel Dänzer               |              https://www.amd.com
Libre software enthusiast             |             Mesa and X developer