LU-6142 mdd: Fix style issues for md_object.h

LU-6142 mdd: Fix style issues for md_object.h

This patch fixes issues reported by checkpatch
for both files lustre/include/md_object.h

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: Id28dc3451cb3c79335684b5aa2dd5f821eba4f36
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/56478
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>