Remove atheros phy.

Change-Id: I7bfbd467668c216cdbc8d4cb4347d54b5cb0bdd2
diff --git a/arch/arm/configs/gfsc100_defconfig b/arch/arm/configs/gfsc100_defconfig
index 54510f6..1fd1739 100644
--- a/arch/arm/configs/gfsc100_defconfig
+++ b/arch/arm/configs/gfsc100_defconfig
@@ -197,7 +197,6 @@
 # CONFIG_NET_VENDOR_STMICRO is not set
 CONFIG_PHYLIB=y
 CONFIG_MARVELL_PHY=y
-CONFIG_ATHEROS_PHY=y
 CONFIG_FIXED_PHY=y
 CONFIG_USB_USBNET=m
 # CONFIG_USB_NET_AX8817X is not set