LU-18420 misc: Use enum mds_ibits_locks instead of __u64 (part 2)

LU-18420 misc: Use enum mds_ibits_locks instead of __u64 (part 2)

This patch is part 2 that uses enum mds_ibits_locks
instead of generic __u64.

Test-Parameters: testlist=runtests serverversion=2.15
Test-Parameters: testlist=runtests clientversion=2.15
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: I77ddc7787c61ce4ef6b9d2041490446d20ce691c
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/56953
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>