anv: garbage collect timeline semaphore when querying value

anv: garbage collect timeline semaphore when querying value

If we don't garbage collect the timeline, the value never progresses
even though work completed.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/3226
Fixes: 34f32a6d664807 ("anv: implement VK_KHR_timeline_semaphore")
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5774>