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iris,anv: Add support for scratch on XeHP

Faith Ekstrand requested to merge gfxstrand/mesa:review/xehp-scratch into main

On GFX version 12.5, scratch access changed to a surface-based model. Instead of each shader type having its own layout based on IDs passed from the relevant fixed-function unit, all scratch access is based on thread IDs like it always has been for compute.

+@jljusten @llandwerlin @kwg for review

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