RFC: blow Ethernet-over-USB into a module

[Andy Green]

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Somebody in the thread at some point said:

| Nah, by all means do what improves the user experience. For
development, I
| have an own defconfig anyways :) Sooner or later I have to work on a
USB mode
| service anyways to allow switching @ runtime.

If nobody has a new idea why it is bad I will apply this tomorrow then.

- -Andy
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