LU-18009 obd: remove o_fid_init/o_fid_fini

LU-18009 obd: remove o_fid_init/o_fid_fini

In every case, o_fid_init is client_fid_init and o_fid_fini is
client_fid_fini. Remove these function pointers.

Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: Idec4e5d7948b12d67f919f58b97a7119775aaf4e
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55667
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>