Potential problem in fec.c for 8xx

[Thomas Lange]

When using MII, the interrupt for link status changes
is enabled before the PHY type has been detected.

If a link status change happens before PHY is detected,
you will get kernel panic in mii_link_interrupt
because the MII functions are undefined.

The correct way to do this would be to move the
enabling of MII interrupts from fec_enet_init
to mii_discover_phy3.

I can prepare a patch if someone points me to
the correct version to patch.

/Thomas

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