Add support for Toradex SMARC Development board, using the WM8904 audio
codec.
This is a carrier board for the Toradex SMARC family, where any SMARC
SoM can be connected to it, therefore this is being added to the
IO-Boards instead of a specific hardware vendor.
Closes: https://github.com/alsa-project/alsa-ucm-conf/pull/562 Signed-off-by: Hiago De Franco <hiago.franco@toradex.com> Signed-off-by: Jaroslav Kysela <perex@perex.cz>