mptcp: unify pm set_flags interfaces

This patch unifies the three PM set_flags() interfaces:

mptcp_pm_nl_set_flags() in mptcp/pm_netlink.c for the in-kernel PM and
mptcp_userspace_pm_set_flags() in mptcp/pm_userspace.c for the
userspace PM.

They'll be switched in the common PM infterface mptcp_pm_set_flags() in
mptcp/pm.c based on whether token is NULL or not.

Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Reviewed-by: Larysa Zaremba <larysa.zaremba@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>