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/ls1088aqds_tfa_defconfig b/configs/ls1088aqds_tfa_defconfig
index 42c29f2..eeb4313 100644
--- a/configs/ls1088aqds_tfa_defconfig
+++ b/configs/ls1088aqds_tfa_defconfig
@@ -85,6 +85,7 @@
 CONFIG_DM_ETH=y
 CONFIG_DM_MDIO=y
 CONFIG_DM_MDIO_MUX=y
+CONFIG_PHY_GIGE=y
 CONFIG_E1000=y
 CONFIG_MII=y
 CONFIG_MDIO_MUX_I2CREG=y