net: Fix ucc_geth.c handling of fixed-link w/o phy-connection-type property.

Previous rework to ucc_geth.c to add of_mdio support (net: Rework
ucc_geth driver to use of_mdio infrastructure) added a block of
code which broke older openfirmware device trees which this case.

This patch removes the offending blurb.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>