Move these option to Kconfig and tidy up existing uses.

The Power PC boards don't have a suitable common element: the common header
files don't appear to line up with the Kconfig files as far as I can tell.
This results in a lot of defconfig changes.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NJagan Teki <jteki@openedev.com>
[trini: Re-migrate, update common/console.c logic]
Signed-off-by: NTom Rini <trini@konsulko.com>