ASoC: use sof_sdw as default Intel SOF SDW machine

Merge series from Bard Liao <yung-chuan.liao@linux.intel.com>:

Currently, we create a ACPI mach table for every new audio
configuration. And all Intel SOF SoundWire configurations point to the
same sof_sdw machine driver. Also, we don't need a specific topology for
a coufguration, we can use the function topology instead. That give us a
change to generate an ACPI mach table based on the SoundWire codec
information reported by the ACPI table and use the sof_sdw machine
driver as the default machine driver.
This will reduce the effort to support a new Intel SOF SoundWire audio
configuration.