This patch allows to dynamically allocate the loopback
like an usual network device.

This global static variable loopback_dev has been replaced by a
netdev pointer and the init function does the usual allocation,
initialization and registering of the loopback.

This patchset is splitted in two parts, the first one is a big but
trivial patch which replace the usage of the static variable loopback_dev
by the usage of a pointer. The second patch is the interesting part where
the loopback is dynamically allocated.

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