net: fec_mxc: Fix MDC for xMII

The MDC signal is available on all xMII (i.e. 'not 7-wire') interfaces, so
mii_speed has to be set for all these interfaces, and not only for MII.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Joe Hershberger <joe.hershberger@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>

drivers/net/fec_mxc.c

@@ -603,7 +603,7 @@ static int fec_init(struct eth_device *dev, bd_t* bd)
 
 	fec_reg_setup(fec);
 
-	if (fec->xcv_type == MII10 || fec->xcv_type == MII100)
+	if (fec->xcv_type != SEVENWIRE)
 		fec_mii_setspeed(fec);
 
 	/*