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/M5475FFE_defconfig b/configs/M5475FFE_defconfig
index c0d1c5e..e26b1fe 100644
--- a/configs/M5475FFE_defconfig
+++ b/configs/M5475FFE_defconfig
@@ -6,4 +6,6 @@
 CONFIG_CMD_I2C=y
 CONFIG_CMD_USB=y
 # CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_CACHE=y