ASoC: SDCA: Add companion amp Function

ASoC: SDCA: Add companion amp Function

Add companion amp into the list of allowed SDCA Functions. More work
will be required to fully support companion amp, but this will let parts
including companion amp functions boot and it is a good first step to
proper support.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Tested-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://patch.msgid.link/20251111140617.2997454-1-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>