iris: Fix dmabuf import failures due to SET_TILING
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.