iris: Fix dmabuf import failures due to SET_TILING

Nanley Chery requested to merge nchery/mesa:dmabuf-import-fix into master

I ran a WIP piglit test which imports an FD with the gen12 CCS modifier. The test fails because the tiling of the BO isn't set to I915_TILING_Y prior to the import.

By removing a SET_TILING call in iris, the issue is fixed and an inconsistency is removed between the platforms which have the tiling uAPI and those that don't.

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