LU-9745 dkms: Fix included dkms.conf file

LU-9745 dkms: Fix included dkms.conf file

When lustre-dkms is installed with other dkms packages,
the PRE/POST scripts don't seem to function correctly.
This includes the correct dkms.conf by default without having
to recreate and reread it during build.

Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Change-Id: Ic6f25480db40d784dfcb3b650f7c869716b903ee
Reviewed-on: https://review.whamcloud.com/28210
Tested-by: Jenkins
Tested-by: Brian J. Murrell <brian.murrell@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Minh Diep <minh.diep@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>