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.
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.