mrg 773ec77d3f introduce a library of common code / backends to share code between
USB ethernet drivers.

usbnet.h introduces a new set of APIs to provide common solutions
for these driver features:
 - USB endpoint pipe handling
 - rx and tx chain handling
 - generic handlers or support for several struct ifnet callbacks
 - MII bus locking
 - interrupt handling
 - partial autoconf handling: much of attach, and detach/activate
   can use common versions directly.

currently, only axen(4) and cdce(4) are converted.  the reductions
in these drivers are quite significant:  if_cdce.c is reduced from
1000 lines to 320 lines, and if_axen is reduced from 1902 lines
to 1021 lines.

add a "usbnet" module and make the if_axen module depend upon it.
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