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anv, iris: Disable pre fetching the binding table entries on DG2

Rohan Garg requested to merge shadeslayer/mesa:fdo/shadeslayer/dg2/thrash_less into main 
On DG2 the HW will fetch the binding entries into the cache
for every single thread when a compute walker is dispatched,
wiping out the advantages of the cache prefetch.

The spec also advises to not do a cache prefetch when we have more than
31 binding table entries, but most real world applications will never
hit that limit.
Edited by Rohan Garg

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