These three methods are no longer used.  Kill them.
Signed-off-by: NTejun Heo <tj@kernel.org>
Reviewed-by: NKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: NFrederic Weisbecker <fweisbec@gmail.com>
Acked-by: NPaul Menage <paul@paulmenage.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>