[ALSA] Add support of VIA VT8251/VT8237A HD-Audio controllers

Documentation,HDA Intel driver
Added the support of VIA VT8251/VT8237A HD-Audio controllers.
They are (almost) compatible with Intel ICH6/7.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index 587eddc..5a7f7f5 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -615,7 +615,8 @@
   Module snd-hda-intel
   --------------------
 
-    Module for Intel HD Audio (ICH6, ICH6M, ICH7), ATI SB450
+    Module for Intel HD Audio (ICH6, ICH6M, ICH7), ATI SB450,
+	       VIA VT8251/VT8237A
 
     model	- force the model name
     position_fix - Fix DMA pointer (0 = FIFO size, 1 = none, 2 = POSBUF)