[ALSA] hda-codec - Add the support of Dell OEM laptops with ALC268

Added the support of Dell OEM laptops (Vostro 1200) with ALC268 codec.
The new model=dell is provided.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index 9f40935e..99b39c8 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -825,6 +825,7 @@
 	  3stack	3-stack model
 	  toshiba	Toshiba A205
 	  acer		Acer laptops
+	  dell		Dell OEM laptops (Vostro 1200)
 	  test		for testing/debugging purpose, almost all controls can
 			adjusted.  Appearing only when compiled with
 			$CONFIG_SND_DEBUG=y