ALSA: hda/realtek - Fix typo for ALC225 model

Fix typo for model alc255-dell1 to alc225-dell1.

Enable headset mode support for new WYSE NB platform.

Fixes: a26d96c7

 ("ALSA: hda/realtek - Comprehensive model list for ALC259 & co")
Signed-off-by: Kailang Yang <kailang@realtek.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>