LU-16741 mdc: rename ptlrpc_req_finished for component mdc

LU-16741 mdc: rename ptlrpc_req_finished for component mdc

Patch renames ptlrpc_req_finished to ptlrpc_req_put for
mdc component

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: I46de8facbafcabbeb5c12daefcc5172f6c9bafd5
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54987
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Patrick Farrell <patrick.farrell@oracle.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>