MII related infrastructure changes.

* Add a new method to set the MII mode - GMII, RGMII, RMII, MII.
  + arge0 supports all four (two for non-Gige interfaces.)
  + arge1 only supports two (one for non-gige interfaces.)
* Set the MII clock speed when changing the MAC PLL speed.
  + Needed for AR91xx and AR71xx; not needed for AR724x.

Tested:

* AR71xx only, I'll do AR913x testing tonight and fix whichever issues
  creep up.

TODO:

* Implement the missing AR7242 arge0 PLL configuration, but don't
  adjust the MII speed accordingly.
* .. the AR7240/AR7241 don't require this, so make sure it's not set
  accidentally.

Bugs (not fixed here):

* Statically configured arge speeds are still broken - investigate why
  that is on the AP96 board.  Autonegotiate is working fine, but there
  still seems to be an occasionally heavy packet loss issue.

Obtained from: Linux/Atheros/OpenWRT

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