[U-Boot] Converting mcfuart.c to driver model

[Simon Glass]

Hi TsiChung,

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
mcfuart.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