LU-8403 obd: remove unused data parameter from obd_notify()

LU-8403 obd: remove unused data parameter from obd_notify()

Remove the unused data parameter from obd_notify() and related
functions.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I1ae72de176ae71441cf486ad6a10c45d57b32aad
Reviewed-on: https://review.whamcloud.com/24428
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Steve Guminski <stephenx.guminski@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>