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turnip: Disable LRZ fast-clear for gen1 and gen2

Danylo Piliaiev requested to merge Danil/mesa:turnip/fix/lrz-fc-non-locked-direction into main

LRZ fast-clear works on all gens, however blob disables it on gen1 and gen2. We also elect to disable fast-clear on these gens because for close to none gains it adds complexity and seem to work a bit differently from gen3+.

Which creates at least one edge case: if first draw which use LRZ fast-clear doesn't lock LRZ direction - the fast-clear value would be undefined.

Closes: #6829 (closed)

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