ASoC: Intel: sof_sdw: Add callbacks to register sidecar devices

Add support for systems that have additional non-SoundWire devices
(sidecars) connected to one of the SoundWire devices in the
system. This is done through the addition of two callbacks, one used
at endpoint parsing time that will return the number of devices and
DAI links to be added, and another called later as the DAI links are
created that will populate those devices into the appropriate arrays.

Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20240426152123.36284-12-pierre-louis.bossart@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>