LU-18113: ptlrpc: move DEBUG_REQ out of spinlock

LU-18113: ptlrpc: move DEBUG_REQ out of spinlock

It may help with slow cancel processing:

Stack :
crash_nmi_callback
nmi_handle
default_do_nmi
do_nmi
end_repeat_nmi
number
vsnprintf
libcfs_debug_msg
_debug_req
ptlrpc_server_request_add
ptlrpc_server_handle_req_in
ptlrpc_main
kthread
ret_from_fork
Progs:  1836895 "ldlm_cn00_011"

Change-Id: I778547c676be8192da2ec30ec5deefb789fe8e7b
HPE-bug-id: LUS-12411
Signed-off-by: Andriy Skulysh <andriy.skulysh@hpe.com>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Reviewed-by: Vitaly Fertman <vitaly.fertman@hpe.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55948
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>