v3dv: fix event synchronization

v3dv: fix event synchronization

Since we now implement events in the GPU we need to be more careful
and insert barriers to honor the dependencies provided by the API
as well as ensuring we are synchronizing these with the compute
queue, since that is how we implement GPU event functionality.

Fixes: ecb01d53fdb413121ce2 ("v3dv: refactor events")
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19458>
(cherry picked from commit e6884df088a1e172cd87956fe9afdac63069eb2c)