sunxi: Enable realtek phy support

Enable building of drivers/net/phy/realtek.c so that realtek phys
get properly initialized.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

include/configs/sunxi-common.h

@@ -310,6 +310,7 @@ extern int soft_i2c_gpio_scl;
 #define CONFIG_PHY_GIGE			/* GMAC can use gigabit PHY	*/
 #define CONFIG_PHY_ADDR		1
 #define CONFIG_MII			/* MII PHY management		*/
+#define CONFIG_PHY_REALTEK
 #endif
 
 #ifdef CONFIG_USB_EHCI_HCD