include: configs: am335x: add Atheros phy support

In AM335x GP EVM, Atheros 8031 phy is used, enable the driver as
AM335x SoC RGMII delay mode has to be enabled in phy as mentioned
in the silicon errata Advisory 1.0.10

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

include/configs/am335x_evm.h

@@ -432,6 +432,8 @@
 #define CONFIG_PHY_GIGE
 #define CONFIG_PHYLIB
 #define CONFIG_PHY_SMSC
+/* Enable Atheros phy driver */
+#define CONFIG_PHY_ATHEROS
 
 /*
  * NOR Size = 16 MiB