Convert CONFIG_MII et al to Kconfig

This converts the following to Kconfig:
   CONFIG_MII
   CONFIG_DRIVER_TI_EMAC

Signed-off-by: Adam Ford <aford173@gmail.com>
Acked-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/configs/SBx81LIFXCAT_defconfig b/configs/SBx81LIFXCAT_defconfig
index 05a1c18..40bc232 100644
--- a/configs/SBx81LIFXCAT_defconfig
+++ b/configs/SBx81LIFXCAT_defconfig
@@ -39,5 +39,6 @@
 CONFIG_MV88E61XX_CPU_PORT=10
 CONFIG_MV88E61XX_PHY_PORTS=0x003
 CONFIG_MV88E61XX_FIXED_PORTS=0x300
+CONFIG_MII=y
 CONFIG_SPI=y
 CONFIG_KIRKWOOD_SPI=y