LU-12610 mdt: remove OBD_ -> CFS_ macros

LU-12610 mdt: remove OBD_ -> CFS_ macros

Remove OBD macros that are simply redefinitions
of CFS macros.

Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Signed-off-by: Ben Evans <beevans@whamcloud.com>
Change-Id: I89edc38316bb121849b24f881a8bafaf78038aa1
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/50806
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>