net: mptcp: use policy generated by YAML spec

generated with:

 $ ./tools/net/ynl/ynl-gen-c.py --mode kernel \
 > --spec Documentation/netlink/specs/mptcp.yaml --source \
 > -o net/mptcp/mptcp_pm_gen.c
 $ ./tools/net/ynl/ynl-gen-c.py --mode kernel \
 > --spec Documentation/netlink/specs/mptcp.yaml --header \
 > -o net/mptcp/mptcp_pm_gen.h

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/340


Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: Mat Martineau <martineau@kernel.org>
Link: https://lore.kernel.org/r/20231023-send-net-next-20231023-1-v2-7-16b1f701f900@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>