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turnip: Fix resolving combined depth+stencil into stencil

Connor Abbott requested to merge cwabbott0/mesa:review/tu-depth-compatible-resolve into main

There is a corner of the VK_KHR_depth_stencil_resolve spec, which we forgot about and wasn't tested until recently, where it's allowed to allowed to resolve a depth+stencil attachment into a stencil-only attachment. In the D24S8 case, this requires us to be creative because we had only implemented something like this in the 3d path but resolves only work on the 2d path. D32S8 doesn't require any special HW support, but there was a driver bug.

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