LU-8072 build: Restore module debuginfo

LU-8072 build: Restore module debuginfo

In commit 3ce96f162a weaccidentally dropped the chmod that makes kernel
modules available to the find-debuginfo.sh.

Reintroducing this chmod allows the lustre debuginfo package to contain
debuginfo for the kenrel modules.

Change-Id: I57e2a6dc248aaccf573e68a49a981bf92c7fbb62
Signed-off-by: Christopher J. Morrone <morrone2@llnl.gov>
Reviewed-on: http://review.whamcloud.com/19805
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: Oleg Drokin <oleg.drokin@intel.com>