uboot-imx

net: mii: Clean up legacy glue that is not used

The cleanup of the legacy mii registration API that's no longer used now
that the drivers have been converted to use the (more) modern API.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>