net: mctp: allow NL parsing directly into a struct mctp_route

The netlink route parsing functions end up setting a bunch of output
variables from the rt attributes. This will get messy when the routes
become more complex.

So, split the rt parsing into two types: a lookup (returning route
target data suitable for a route lookup, like when deleting a route) and
a populate (setting fields of a struct mctp_route).

In doing this, we need to separate the route allocation from
mctp_route_add, so add some comments on the lifetime semantics for the
latter.

Signed-off-by: Jeremy Kerr <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Paolo Abeni <[email protected]>

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