LU-3963 libcfs: remove last cfs wrappers for cpu node handling

LU-3963 libcfs: remove last cfs wrappers for cpu node handling

Th last of the cfs wrapper cfs_for_each_possible_cpu is removed
with this patch.

Change-Id: I2c626e587343c3950599d1da6442cd25cb2d27a6
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Reviewed-on: http://review.whamcloud.com/11729
Tested-by: Jenkins
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>