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turnip: reduce maxComputeWorkGroupSize to respect hw limits

Danylo Piliaiev requested to merge Danil/mesa:turnip/fix/maxComputeWorkGroupSize into main

Blob advertises { 1024, 1024, 64 }, but from tests they all could be 1024.

Blob also has maxComputeWorkGroupInvocations = 1024, trivial tests are passing with it being 2048. However, higher than this and fences in shader start causing hangs.

Fixes tests:

 dEQP-VK.compute.basic.max_local_size_x
 dEQP-VK.compute.basic.max_local_size_y
 dEQP-VK.compute.basic.max_local_size_z

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