venus: force a roundtrip after vn_renderer_bo_create_dmabuf

This is to ensure the kernel operations and the later ring operations
are in the right order.

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/10390>
1 file changed