phy: atheros: Use ar8035_config for AR8031

Commit 08ad9b068afb88 (" ar8031: modify the config func of ar8031 to
ar8021_config") selected 'ar8021_config' as the configuration function
for AR8031.

The correct would be to use 'ar8035_config' instead as AR8031/AR8035
have the same programming model and even share the same phy driver
in the linux kernel: drivers/net/phy/at803x.c.

Tested on a mx6qsabresd and wandboard, which now can work without
any PHY setup code in the board files.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

drivers/net/phy/atheros.c

@@ -51,7 +51,7 @@ static struct phy_driver AR8031_driver =  {
 	.uid = 0x4dd074,
 	.mask = 0xffffffef,
 	.features = PHY_GBIT_FEATURES,
-	.config = ar8021_config,
+	.config = ar8035_config,
 	.startup = genphy_startup,
 	.shutdown = genphy_shutdown,
 };