radeonsi: add helper to use si_screen::aux_context
This context needs to be locked before usage, and flushed after. If it's forgotten, radeonsi may crash (eg #6666). To avoid this kind of error, introduce 2 helpers. cc: mesa-stable Reviewed-by:Marek Olšák <marek.olsak@amd.com> Part-of: <mesa/mesa!17032>
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