[PATCH] PPC 4xx EMAC driver: fix VSC8201 PHY initialization

* MII registers must override strap pins
* disable "echo" mode to make 10/HDX work (Franz Sirl)

Signed-off-by: Eugene Surovegin <ebs@ebshome.net>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>