ALSA: hda/realtek: Support mute LED for Yoga with ALC287

Support mute LED on keyboard for Lenovo Yoga series products with
Realtek ALC287 chipset.

Tested on Lenovo Slim Pro 7 14APH8.

[ slight comment cleanup by tiwai ]

Signed-off-by: Jackie Dong <xy-jackie@139.com>
Link: https://patch.msgid.link/20250714094655.4657-1-xy-jackie@139.com


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