ucm2: sof-soundwire: cs42l43: support UAJ-less configuration

ucm2: sof-soundwire: cs42l43: support UAJ-less configuration

In some cases cs42l43/cs42l43b devices can be set up without UAJ. In
this case, guard the ConflictingDevices behind a check for a cs42l43's
headset's presence so the UCM can still load even if the headset is
missing.

Closes: https://github.com/alsa-project/alsa-ucm-conf/pull/738
Signed-off-by: Maciej Strozek <mstrozek@opensource.cirrus.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>