When a task changes slice and its cgroup se is already on_rq, the cgroup
se will not be enqueued again, and hence the root->min_slice leaves
unchanged.
Force propagating it when se doesn't need to be enqueued (or dequeued).
Ensure the se hierarchy always get the latest min_slice.
Fixes: aef6987d8954 ("sched/eevdf: Propagate min_slice up the cgroup hierarchy")
Signed-off-by: Tianchen Ding <dtcccc@xxxxxxxxxxxxxxxxx>