The private BO can get removed due to WSI aliasing and that breaks the
submission code (expecting one).
Delay the registration on the device to when the image actually gets
bound and there is a private BO.
Fixes: b21e62b71a ("anv: avoid leaking private binding for aliased wsi image")
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36474>