iris: Finish aux import in iris_resource_from_handle

This allows us to delete iris_resource_unfinished_aux_import, which
incorrectly assumed that a CCS-enabled resource needs an aux BO.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12795>
5 files changed