This is a resend of all of my recent usbnet additions which
center on adding ethtool_ops support.  All have been re-diffed
against the latest usbnet from BK.

Changes:
* Add ethtool_ops support to usbnet
* Add GPIO bit toggling upon initialization of ax8817x devices
  so that xmit works properly
* Add Wake-On-Lan and eeprom dump support for ax8817x devices
  (this only adds the config support for WOL, actual operation
   is more of a USB/Power Management function)
* Change ax8817x_set_multicast to not kmalloc for the filter
  since there was no clean way to free the memory after URB submit.
  Instead, we make use of the 20 byte dev->data.