Revert "winsys/amdgpu: use AMDGPU_IB_FLAG_PREAMBLE for the CS preamble on gfx10+" This reverts commit 8edafaa25c5d649af6c016a61383d784a1ebb078. This fixes hangs on Navi21. Reviewed-by: Marek Olšák <marek.olsak@amd.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17032>