Further ar71xx MII support improvements.

* Flesh out the PLL configuration fetch function, which will return the PLL
  configuration based on the unit number and speed.
* Remove the PLL speed config logic from the AR71xx/AR91xx chip PLL config
  function - pass in a 'pll' value instead.
* Modify arge_set_pll() to:
  + fetch the PLL configuration
  + write the PLL configuration
  + update the MII speed configuration.

This will allow if_arge to override the PLL configuration as required.

Obtained from:	Linux/Atheros/OpenWRT

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