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/C29XPCIE_NAND_defconfig b/configs/C29XPCIE_NAND_defconfig
index d342640..726e08e 100644
--- a/configs/C29XPCIE_NAND_defconfig
+++ b/configs/C29XPCIE_NAND_defconfig
@@ -11,6 +11,7 @@
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_SF=y
 CONFIG_CMD_I2C=y
+CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_EON=y