netlink: specs: mptcp: fix port endianness

The MPTCP port attribute is in host endianness, but was documented
as big-endian in the ynl specification.

Below are two examples from net/mptcp/pm_netlink.c showing that the
attribute is converted to/from host endianness for use with netlink.

Import from netlink:
  addr->port = htons(nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_PORT]))

Export to netlink:
  nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_PORT, ntohs(addr->port))

Where addr->port is defined as __be16.

No functional change intended.

Fixes: bc8aeb2 ("Documentation: netlink: add a YAML spec for mptcp")
Signed-off-by: Asbjørn Sloth Tønnesen <[email protected]>
Reviewed-by: Davide Caratti <[email protected]>
Reviewed-by: Matthieu Baerts (NGI0) <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Asbjørn Sloth Tønnesen

Documentation/netlink/specs/mptcp_pm.yaml

@@ -109,7 +109,6 @@ attribute-sets:
       -
         name: port
         type: u16
-        byte-order: big-endian
       -
         name: flags
         type: u32