cgroup: Minor reorganization of cgroup_create()

cgroup: Minor reorganization of cgroup_create()

cgroup_bpf init and exit handling will be moved to a notifier chain. In
prepartion, reorganize cgroup_create() a bit so that the new cgroup is fully
initialized before any outside changes are made.

- cgrp->ancestors[] initialization and the hierarchical nr_descendants and
  nr_frozen_descendants updates were in the same loop. Separate them out and
  do the former earlier and do the latter later.

- Relocate cgroup_bpf_inherit() call so that it's after all cgroup
  initializations are complete.

No visible behavior changes expected.

Signed-off-by: Tejun Heo <tj@kernel.org>