Begin fleshing out MII clock rate configuration changes.

These are needed for some particular port configurations where the default
speed isn't suitable for all link speed types. (Ie, changing 10/100/1000MBit
PLL rate requires a similar MII clock rate, rather than a fixed MII rate.)

This is:

* only currently implemented for the ar71xx;
* isn't used anywhere (yet), as the final interface for this hasn't yet
  been determined.

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