netdev - wireguard: add netlink mcast on endpoint change

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Date:   Sun, 10 Apr 2022 21:06:34 +0200
From:   Linus Karl <linus@...z.li>
To:     "Jason A. Donenfeld" <Jason@...c4.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     wireguard@...ts.zx2c4.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: wireguard: add netlink mcast on endpoint change

This patch adds the possibility to retrieve notifications of peer
endpoint changes via netlink multicast messages. It has been a while
since I posted v2, the main difference is that I've added an extra
attribute to the netlink device attributes to allow enabling or
disabling of this feature. It is per default disabled.