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/bct-brettl2_defconfig b/configs/bct-brettl2_defconfig
index c7e223a..3e61a3f 100644
--- a/configs/bct-brettl2_defconfig
+++ b/configs/bct-brettl2_defconfig
@@ -5,6 +5,8 @@
 CONFIG_CMD_GPIO=y
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_DHCP=y
+CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
 CONFIG_CMD_DNS=y
+CONFIG_CMD_CACHE=y
 CONFIG_NET_RANDOM_ETHADDR=y