Merge patch series "Almost complete DM_SERIAL migration"

Merge patch series "Almost complete DM_SERIAL migration"

Tom Rini <trini@konsulko.com> says:

In a private thread, Simon asked about what's needed to get PowerPC
migrated to DM_SERIAL. I went and took a look, and to complete the
entire DM_SERIAL migration (excluding SPL/TPL) we're actually nearly
there. This series first migrates PowerPC (and some NXP Layerscape
boards that share history more clearly with PowerPC parts), with the
biggest change being to make sure we still use the correct legacy
drivers in SPL/TPL (where SPL is extremely constrained). With that out
of the way, I looked at what was left. With two exceptions, it's
platforms which can be trivially enabled for conversion, and so we do
that.

Link: https://lore.kernel.org/r/20250502201226.1369013-1-trini@konsulko.com