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.

Lustre-change: https://review.whamcloud.com/#/c/28210/


Lustre-commit: 2f4d11de2c37803822d6c1df0b7df6828477c11a

Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Change-Id: Ic6f25480db40d784dfcb3b650f7c869716b903ee
Reviewed-on: https://review.whamcloud.com/28224


Tested-by: Jenkins
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: John L. Hammond <john.hammond@intel.com>