e1000: add support for Intel EP80579

This has been written for Avencall's XiVO IPBX Open Hardware platform,
and therefore makes several asumptions relative to this platform in
order to simplify the code. Making it more general will require some
work.

Here are some of the areas that are not as generic as they could be:

* In e1000_ep80579.c, the media_type is set unconditionally:
        hw->phy.media_type = e1000_media_type_copper;

* The MAC address are set randomly, as the current prototype does not
  have the mechanism that will be used to store MAC addresses yet. (We
  don't have an EEPROM for storing the MAC addresses like other e1000
  products do. We plan to use a microcontroller that will communicate
  via SMBus instead)

* ops.get_link_up_info is always e1000_get_speed_and_duplex_copper_generic

* PHY is assumed to be Marvell M881141

* Autonegociation is assumed

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