chtnau8824: Mono speaker fixes

chtnau8824: Mono speaker fixes

2 mono speaker setup fixes:

1. Use the kernel's components string to check for a mono-speaker device
when the board has a components string.

2. So far known nau8824 boards with a mono speaker where using the right
speaker channel, which is unusual. Normally mono speaker setups use
only the left speaker channel. The Cyberbook T116 tablet is a nau8824
based model, which indeed uses the left speaker channel for its single
speaker.

Modify ucm2/codecs/nau8824/MonoSpeaker.conf to send a left+right
channel mix to both speaker channels, so that things will work
independent of which speaker channel is used for a mono setup.

Link: https://lore.kernel.org/alsa-devel/20231021143109.52210-1-hdegoede@redhat.com/
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>