LU-9183 llite: handle removal of parent argument of ->d_compare()

LU-9183 llite: handle removal of parent argument of ->d_compare()

In commit 6fa67e707559303e086303aeecc9e8b91ef497d5 the parent
parameter for ->d_compare() was removed.

Change-Id: Ia241619c3ade13036154973a19f44a2083a9bc53
Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-on: https://review.whamcloud.com/25818
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>