ALSA: hda/realtek - Add supported mute Led for HP

HP Pavilion x360 Convertible machine, it supported mute led.
GPIO4 high will turn on led.
The patch will enable control led via GPIO4 pin.

Signed-off-by: Kailang Yang <kailang@realtek.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/1ae4d98e92c147b780ace3911c4e1d73@realtek.com


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