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/O2MNT_defconfig b/configs/O2MNT_defconfig
index b3a656a..e135f93 100644
--- a/configs/O2MNT_defconfig
+++ b/configs/O2MNT_defconfig
@@ -6,5 +6,7 @@
 CONFIG_CMD_I2C=y
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_DHCP=y
+CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_FAT=y
 CONFIG_OF_LIBFDT=y