ALSA: hda/realtek - New codec support for ALC257

ALSA: hda/realtek - New codec support for ALC257

BugLink: https://bugs.launchpad.net/bugs/1738911
Add new support for ALC257 codec.

[ It's supposed to be almost equivalent with other ALC25x variants,
  just adding another type and id -- tiwai ]

Signed-off-by: Kailang Yang <kailang@realtek.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
(cherry picked from commit f429e7e494afaded76e62c6f98211a635aa03098)
Signed-off-by: Hui Wang <hui.wang@canonical.com>
Acked-by: Shrirang Bagul <shrirang.bagul@canonical.com>
Acked-by: Aaron Ma <aaron.ma@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>