This converts the following to Kconfig:
   CONFIG_MII
   CONFIG_DRIVER_TI_EMAC
Signed-off-by: NAdam Ford <aford173@gmail.com>
Acked-by: NJagan Teki <jagan@amarulasolutions.com>
Acked-by: NJoe Hershberger <joe.hershberger@ni.com>