bdinfo: net: Drop legacy ethernet bdinfo

bdinfo: net: Drop legacy ethernet bdinfo

This code pre-dates driver model and the migration date is nearly upon us.
Pare the print_eths() function down and enable it for driver model, since
it works correctly.

The IP address is already printed in print_eth_ip_addr() so we can remove
that.

Since this results in a one-line print_eths() function, inline it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>