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anv: add a command streamer stall on Xe2+ when switching pipelines

Rohan Garg requested to merge shadeslayer/mesa:review/defer_gpgpu_hdc_flush into main

What does this MR do and why?

anv: untyped dataport cache flush can only be emitted on the GPGPU pipeline on Xe2

Xe2+ gets rid of PIPELINE_SELECT, so we need to make sure we add a stall
when switching pipelines

Signed-off-by: Rohan Garg <rohan.garg@intel.com>
Edited by Rohan Garg

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