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turnip: Don't disable LRZ for color write mask channels beyond the format's

Emma Anholt requested to merge anholt/mesa:tu-lrz into main

aztec_ruins under ANGLE was getting LRZ writes disabled because 0xf out of the 0x3 mask was enabled. The goal was to see if there are partial writes being done, though. This caused a 2-3% performance regression.

Fixes: 85d0205d ("tu: Implement extendedDynamicState3ColorWriteMask")

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