Revert "mesa/st: Use do_once for one-time init"

This reverts commit bcb2981e145f0c2a54a637e20b6c55eaf316c04f.

Acked-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7760>
2 files changed