freedreno/ir3: move rasterflat handling out of ir3
Remove the rasterflat shader key. a4xx/a5xx/a6xx will now do the same thing as a3xx (bary.f with flat interpolation set by the interp regs when flat shading is enabled).
Edited by Jonathan Marek
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
Remove the rasterflat shader key. a4xx/a5xx/a6xx will now do the same thing as a3xx (bary.f with flat interpolation set by the interp regs when flat shading is enabled).