[ALSA] hda-codec - Add more Dell systems

This patch adds support for Dell E520 and a couple of other 965 based systems.

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 241e26c..68c3bbd 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -975,6 +975,7 @@
 	  ref		Reference board
 	  3stack	D965 3stack
 	  5stack	D965 5stack + SPDIF
+	  dell-3stack	Dell E520
 
 	STAC9872
 	  vaio		Setup for VAIO FE550G/SZ110