mptcp: pm: remove '_nl' from mptcp_pm_nl_work

mptcp: pm: remove '_nl' from mptcp_pm_nl_work

Currently, in-kernel PM specific helpers are prefixed with
'mptcp_pm_nl_'. But here 'mptcp_pm_nl_work' is not specific to this PM:
it is called from the core to call helpers, some of them needed by both
the in-kernel and userspace PMs.

To avoid confusions, the '_nl' bit has been removed from the name.

Also used 'worker' instead of 'work', similar to protocol.c's worker.

No behavioural changes intended.

Reviewed-by: Geliang Tang <geliang@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20250307-net-next-mptcp-pm-reorg-v1-4-abef20ada03b@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>