LU-7914 obdclass: Removed unused reference of cl_page_list_own()

LU-7914 obdclass: Removed unused reference of cl_page_list_own()

cl_page_list_own() is unused and thus could be removed altogether.

Change-Id: I57c88a484f5d624e413d1b555473819f8785dd05
Signed-off-by: Parinay Kondekar <parinay.kondekar@seagate.com>
Reviewed-on: http://review.whamcloud.com/20886
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Frank Zago <fzago@cray.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>