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iris: Increase the maximum grid size

Kenneth Graunke requested to merge kwg/mesa:iris-grid-size into main

I had simply copied these values from another driver when adding initial compute support to iris. The actual hardware limit is UINT32_MAX (see the GPGPU_WALKER/COMPUTE_WALKER ThreadGroupID{X,Y,Z}Dimension fields).

Thanks to Karol Herbst for noticing the unnecessarily low limit.

References: #7676 (closed)

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