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/eb_cpu5282_internal_defconfig b/configs/eb_cpu5282_internal_defconfig
index ca9e8a0..0cce41c 100644
--- a/configs/eb_cpu5282_internal_defconfig
+++ b/configs/eb_cpu5282_internal_defconfig
@@ -20,5 +20,6 @@
 CONFIG_LED_STATUS_BOOT=0
 CONFIG_LED_STATUS_CMD=y
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_MII=y
 CONFIG_VIDEO=y
 # CONFIG_CFB_CONSOLE is not set