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/MPC8548CDS_defconfig b/configs/MPC8548CDS_defconfig
index 3b89bda..a42d991 100644
--- a/configs/MPC8548CDS_defconfig
+++ b/configs/MPC8548CDS_defconfig
@@ -5,6 +5,7 @@
 CONFIG_OF_STDOUT_VIA_ALIAS=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_I2C=y
+CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
 CONFIG_NETDEVICES=y
 CONFIG_E1000=y