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iris: Simplify iris_transfer_map compression logic

Nanley Chery requested to merge nchery/mesa:lodbias-changes into master

When 3915b56e enabled the I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS modifier, Clayton found that the lodbias piglit test started taking a long time and timing-out in the CI. I narrowed the issue down to frequent glReadPixels calls and came up with a driver heuristic to detect and work around it. Ultimately however, I decided to fix the issue with piglit!359 (merged) because I couldn't find any other application to benefit from the driver change. This MR contains some code improvements from the driver fix that I think are still useful to keep.

This also addresses part of @jekstrand's comment in #2617 (closed).

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