Document the dai-link subnodes and the audio-routing property, allowing
to describe machine specific audio hardware and links in device tree.

While at it, also deprecate the old properties which were previously
used with driver hardcoded configuration.

Also, since describing machine specific audio hardware and links replaces
the now deprecated old logic doing the same in a driver hardcoded fashion,
it is not allowed to have both the old and new properties together.
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20240416071410.75620-15-angelogioacchino.delregno@collabora.comSigned-off-by: Mark Brown <broonie@kernel.org>