LU-8703 libcfs: remove usless CPU partition code

LU-8703 libcfs: remove usless CPU partition code

 * remove scratch buffer and mutex which guard it.
 * remove global cpumask and spinlock which guard it.
 * remove cpt_version for checking CPUs state change during setup
   because of just disable CPUs state change during setup.
 * remove whole global struct cfs_cpt_data cpt_data.
 * remove few unused APIs.

Change-Id: I0cc853d57952e76cf32801838a19e6872905aaa0
Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-on: https://review.whamcloud.com/23303
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Doug Oucharek <doug.s.oucharek@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>