ALSA: hda: cs35l41: Add support for center channel in CS35L41 HDA

Currently only left and right channels are supported for each amp.
Support is needed for a center channel, using both left and right
channel audio.

Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Link: https://patch.msgid.link/20250612160029.848104-2-sbinding@opensource.cirrus.com


Signed-off-by: Takashi Iwai <tiwai@suse.de>