[U-Boot] Conversion of serial_bfin to driver model

[Simon Glass]

Hi Sonic,

I'm sorry if you have not heard about this before. I sent out an email
to all maintainers some months ago.

You are listed as the maintainer of a few boards which use the
serial_bfin.c serial driver. We are trying to convert all of these
drivers to driver model. Please see doc/driver-model/serial-howto.txt.

Do you have an update please?

Regards,
Simon