Make sure set the media type in the phy, we cannot trust it to have chosen

the type we happen to want.

Bug triggered by net-booting soekris hardware which comes up in 10/hdx mode
by default.

sys/dev/mii/ukphy.c

@@ -167,6 +167,7 @@ ukphy_attach(dev)
 	printf("\n");
 
 	MIIBUS_MEDIAINIT(sc->mii_dev);
+	mii_phy_setmedia(sc);
 
 	return(0);
 }