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iris,anv: No need to emit PIPELINE_SELECT on Xe2

Sagar Ghuge requested to merge sagarghuge/mesa:review/drop_pipeline_select into main

What does this MR do and why?

On Xe2+, PIPELINE_SELECT is getting deprecated (Bspec 55860), as a
result we don't have to do the stalling flushes while switching between
different pipelines.

HW is now ensuring coherency between switching between 3D and compute engines. 

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