cgroup/cpuset: Revert "Allow suppression of sched domain rebuild in update_cpumasks_hier()"

[ Upstream commit bcd7012a ]

Revert commit 3ae0b773 ("cgroup/cpuset: Allow suppression of sched
domain rebuild in update_cpumasks_hier()") to allow for an alternative
way to suppress unnecessary rebuild_sched_domains_locked() calls in
update_cpumasks_hier() and elsewhere in a following commit.

Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Stable-dep-of: a22b3d54 ("cgroup/cpuset: Fix race between newly created partition and dying one")
Signed-off-by: Sasha Levin <sashal@kernel.org>