configs: Re-sync with cmd/Kconfig

Update the config.h and defconfig files for the commands that 8e3c036
converted over to Kconfig

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/3c120_defconfig b/configs/3c120_defconfig
index 5fdaee0..c145caf 100644
--- a/configs/3c120_defconfig
+++ b/configs/3c120_defconfig
@@ -15,6 +15,7 @@
 # CONFIG_CMD_ITEST is not set
 CONFIG_CMD_DHCP=y
 # CONFIG_CMD_NFS is not set
+CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_ALTERA_PIO=y