We need to set this, otherwise we end up failing tests.
Fixes: 4e111c259c ("panvk: Lower shared memory")
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Mary Guillemard <mary.guillemard@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34514>