ALSA: hda/realtek - Add Headset Mic supported for HP cPC

HP ALC671 need to support Headset Mic.

Signed-off-by: Kailang Yang <kailang@realtek.com>
Link: https://lore.kernel.org/r/06a9d2b176e14706976d6584cbe2d92a@realtek.com


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