Fix for autonegotiation of ppc 40x ethernet driver

[Benjamin Herrenschmidt]

> I wont force a single mode. I want to limit the advertising to a
> limited _range_. So autonegotiation is still enabled - just with a
> limited range. The forcing of a mode (i.e. disabling autonegotiation)
> is working already without this patch.

Ah ok. Well... we indeed need to and the two masks then, though it
should be possible to find a phy-specific way to get the exact
speed that was actually selected...

Ben.


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