Revert "venus: remove vn_ring_wait_all"

This reverts commit 7253e61d9d1a82f1fa0eac087a80c4a0957e1d14.

Signed-off-by: Yiwei Zhang <zzyiwei@chromium.org>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14657>
3 files changed