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panfrost: Fix discard behaviour on Bifrost

Icecream95 requested to merge icecream95/mesa:discard into master

Set zs_update_operation to FORCE_LATE, as we don't want to update depth if the fragment is discarded.

Although we don't yet enable FPK often, reduce the pixel kill operation to WEAK_EARLY, which matches the blob.

@alyssa It would be nice to have some documentation for the depth update / FPK flags, as changing partition priorities and rebooting into Chrome OS to check what the blob does is annoying.

stk

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