drm/nouveau: Rework tile region handling.
The point is to share more code between the PFB/PGRAPH tile region hooks, and give the hardware specific functions a chance to allocate per-region resources. Signed-off-by: NFrancisco Jerez <currojerez@riseup.net> Signed-off-by: NBen Skeggs <bskeggs@redhat.com>
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