ALSA: hda/realtek - restore auto-mute mode for Dell Chrome platform

This board need to shutdown Class-D amp to avoid EMI issue.
Restore the Auto-Mute mode item will off pin control when Auto-mute mode was enable.

Signed-off-by: Kailang Yang <kailang@realtek.com>
Links: https://lore.kernel.org/ee8bbe5236464c369719d96269ba8ef8@realtek.com


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