[ALSA] hda-codec - Add support for Sigmatel STAC9202/9250/9251 codecs

This patch adds support for Gateway laptops based on the
Sigmatel STAC9250 codecs, as well as basic support for
STAC9202/9250/9251 codecs.  Some Gateway systems require
probe_mask=1 to work.  More work to be done prior to alsa 1.0.14
final.

Signed-off-by: Tobin Davis <tdavis@dsl-only.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index 14debd5..ce2f5fa 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -890,6 +890,11 @@
 	  3stack	D945 3stack
 	  5stack	D945 5stack + SPDIF
 
+	STAC9202/9250/9251
+	  ref		Reference board, base config
+	  m2-2		Some Gateway MX series laptops
+	  m6		Some Gateway NX series laptops
+
 	STAC9227/9228/9229/927x
 	  ref		Reference board
 	  3stack	D965 3stack