global: Convert almost all remaining non-DM_SERIAL users

global: Convert almost all remaining non-DM_SERIAL users

This converts almost all of the remaining non-DM_SERIAL users to enable
DM_SERIAL. These are platforms where there have long been other SoC
boards that have switched and so it's been a matter of inertia keeping
these from being converted. Do so now.

Signed-off-by: Tom Rini <trini@konsulko.com>