netdev - support for USB network devices without MDIO to report speed

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Message-Id: <20210107113518.21322-1-oneukum@suse.com>
Date:   Thu,  7 Jan 2021 12:35:15 +0100
From:   Oliver Neukum <oneukum@...e.com>
To:     netdev@...r.kernel.org, davem@...emloft.net, roland@...nel.org
Subject: support for USB network devices without MDIO to report speed

The assumption that a USB network devices would contain an MDIO
accessible to the host is true only for a subset of genuine
ethernet devices. It is not true for class devices like NCM.
Hence an implementation purely internal to usbnet is needed.