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anv/iris: Drop depth cache flush requirement after depth clear/resolve on Gfx 12+

Sagar Ghuge requested to merge sagarghuge/mesa:wip/drop_depth_cache_flush into main

What does this MR do and why?

From Bspec 46959, a programming note:

Since HZ_OP has to be sent twice (first time set the clear/resolve
state and 2nd time to clear the state), and HW internally flushes the
depth cache on HZ_OP, there is no need to explicitly send a Depth
Cache flush after Clear or Resolve.

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