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/cm_t3517_defconfig b/configs/cm_t3517_defconfig
index 2fef32e..edb114e 100644
--- a/configs/cm_t3517_defconfig
+++ b/configs/cm_t3517_defconfig
@@ -42,10 +42,11 @@
 CONFIG_MMC_OMAP_HS=y
 CONFIG_MTD_PARTITIONS=y
 CONFIG_NAND=y
-CONFIG_NETDEVICES=y
+CONFIG_MII=y
 CONFIG_SMC911X=y
 CONFIG_SMC911X_BASE=0x2D000000
 CONFIG_SMC911X_32_BIT=y
+CONFIG_DRIVER_TI_EMAC=y
 CONFIG_CONS_INDEX=3
 CONFIG_SYS_NS16550=y
 CONFIG_SPI=y