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etnaviv: disable linear PE by default

Lucas Stach requested to merge lynxeye/mesa:etnaviv-disable-linear-pe into main

Linear PE causes a lot of issues in the ZS stage. While some of those issues can be worked around on newer GPU cores by doing all ZS operations in the late stage, GC600 r4653 exhibits spurious Z fails when linear PE is active even though this GPU does not even have a early Z stage.

Disable linear PE for now, until the issue can be analyzed further. Leave the debug option in place to allow to enable linear PE for testing.

CC @marex

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