Convert CONFIG_PHYLIB et al to Kconfig

This converts the following to Kconfig:
   CONFIG_PHYLIB
   CONFIG_PHY_ATHEROS
   CONFIG_PHY_GIGE
   CONFIG_MII

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/m53menlo_defconfig b/configs/m53menlo_defconfig
index 193c63e..48d7566 100644
--- a/configs/m53menlo_defconfig
+++ b/configs/m53menlo_defconfig
@@ -91,6 +91,7 @@
 CONFIG_DM_MDIO=y
 CONFIG_DM_ETH_PHY=y
 CONFIG_FEC_MXC=y
+CONFIG_MII=y
 CONFIG_PINCTRL=y
 CONFIG_PINCTRL_IMX5=y
 CONFIG_DM_REGULATOR=y