iris: Drop iris_resource_alloc_separate_aux

When this function was called, the res->mod_info->aux_usage parameter
was ISL_AUX_USAGE_NONE. As a result, no aux buffer was ever allocated.

Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6311>
1 file changed