ucm2: Qualcomm: Thinkpad T14s speaker mute LED support

[GitHub pull_request - edited <github@alsa-project.org>]

alsa-project/alsa-ucm-conf pull request #880 was edited from sre:

The T14s Gen6 Snapdragon has an LED in the mute button to signal that the speaker is muted. The kernel driver for the embedded controller exposes it as `/sys/class/leds/platform::mute` with trigger set to `audio-mute`. At the same time the hardware toggles the LED state when the mute key is pressed (independent of the real audio state) giving a fake suggestion of things working correctly.

This series properly attaches the speaker mute state to this LED. To be functional, it depends on a kernel driver change for the speaker amplifier exposing a mute control knob. All handling has been implemented in a way, that using a kernel without this feature will continue to work as before.

Kernel Patch: https://lore.kernel.org/linux-sound/20261014-wsa884x-mute-support-v1-1-74d98d79e635@collabora.com/

Request URL   : https://github.com/alsa-project/alsa-ucm-conf/pull/880
Patch URL     : https://github.com/alsa-project/alsa-ucm-conf/pull/880.patch
Repository URL: https://github.com/alsa-project/alsa-ucm-conf