iris/isl: Tile64-related improvements
As a way to verify the work I'm doing on Sparse, which makes heavy use of the Tile64 format, I decided to make our driver choose Tile64 over Tile4 by patching isl_surf_choose_tiling() and got some errors from CI, so I came up with the first patch.
The second patch is the result of me playing with 1D formats during Sparse development.