ALSA: hda/realtek - Support Dell headset mode for New AIO platform

commit c2a7c55a upstream.

Dell has new platform for ALC274.
This will support to enable headset mode.

Signed-off-by: Kailang Yang <kailang@realtek.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>