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/lx2160aqds_tfa_SECURE_BOOT_defconfig b/configs/lx2160aqds_tfa_SECURE_BOOT_defconfig
index aebeaff..e502f61 100644
--- a/configs/lx2160aqds_tfa_SECURE_BOOT_defconfig
+++ b/configs/lx2160aqds_tfa_SECURE_BOOT_defconfig
@@ -71,6 +71,7 @@
 CONFIG_DM_MDIO=y
 CONFIG_DM_MDIO_MUX=y
 CONFIG_E1000=y
+CONFIG_MII=y
 CONFIG_MDIO_MUX_I2CREG=y
 CONFIG_FSL_LS_MDIO=y
 CONFIG_NVME=y