ALSA HDA VIA: Add VIA_CTL_WIDGET_ANALOG_MUTE control type

Enter low power state if AA-Path volume is muted.

Signed-off-by: Lydia Wang <lydiawang@viatech.com.cn>
Signed-off-by: Logan Li <loganli@viatech.com.cn>
Signed-off-by: Takashi Iwai <tiwai@suse.de>