intel/blorp: Remove Gfx8- references in BRW code
On top of !27563 (merged).
If a driver uses BRW it is Gfx9+, so we can remove those references from the BRW specific codepaths in blorp.
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On top of !27563 (merged).
If a driver uses BRW it is Gfx9+, so we can remove those references from the BRW specific codepaths in blorp.