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tu: Re-enable tiled non-ubwc R8G8 images

Connor Abbott requested to merge cwabbott0/mesa:review/tu-r8g8-tiled into main

What does this MR do and why?

tu: Re-enable tiled non-ubwc R8G8 images

This effectively reverts a70b197741f ("turnip: Force linear mode for
non-ubwc R8G8 formats"), except that in the meantime we added HIC
support without supporting R8G8 so we still have to force linear tiling
in that case. Tiled uncompressed images will be used for sparse
residency support, it's not valid to arbitarily not support sparse
texturing on R8G8, and the blob does use a tiled uncompressed image in
that case.

The original test case doesn't hang on a650 for me. Hopefully we've
fixed it with some other fix since then.

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