psp: notify about a disassociation once it has happened

The dev-change-ntf generated by dev-disassoc was built before the
association was unlinked, so the assoc-list it carried still contained
the device which was going away, and nothing corrected it afterwards.
We don't really expect associations to change during a lifetime of
a netns but this is still wrong. Netlink listeners need to be able
to tell the current "state of the world" based on notifications.

The notification had to be sent early because psp_nl_multicast_per_ns()
derives the set of namespaces to notify from the association list, so
a namespace losing its last associated device becomes unreachable once
the entry is gone. In that case - get the netns from the netdev itself,
and send that namespace a dev-del-ntf. If the netns had multiple
associated netdevs and only one disassoc'd we'll still send a change
notification, just with a correct list.

Reviewed-by: Daniel Zahka <daniel.zahka@gmail.com>
Link: https://patch.msgid.link/20260912200426.121025-5-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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