LU-3963 libcfs: Delete empty source files for linux layer

LU-3963 libcfs: Delete empty source files for linux layer

Some of the files in libcfs/libcfs/linux are actually
empty. Remove them.

Change-Id: Ic49d3bea7777488ab51fdcdc1f93ed516654c665
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Reviewed-on: http://review.whamcloud.com/11725
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Tested-by: Jenkins
Reviewed-by: John L. Hammond <john.hammond@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>