ALSA: support Sony Vaio TT

with BIOS probing only we offer a non functional headphone swith and
volume slider.

Signed-off-by: Guido Günther <agx@sigxcpu.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/Documentation/sound/alsa/HD-Audio-Models.txt b/Documentation/sound/alsa/HD-Audio-Models.txt
index 29c6125..54b0805 100644
--- a/Documentation/sound/alsa/HD-Audio-Models.txt
+++ b/Documentation/sound/alsa/HD-Audio-Models.txt
@@ -159,6 +159,7 @@
   3stack-6ch-intel Intel DG33* boards
   asus-p5q	ASUS P5Q-EM boards
   mb31		MacBook 3,1
+  sony-vaio-tt  Sony VAIO TT
   auto		auto-config reading BIOS (default)
 
 ALC861/660