ALSA: hda - Remove ALC268 model quirks

Get rid of the rest of ALC268 model quirks.  They are all confirmed to
work with the auto-parser, too.

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 e444c0d..b6af77e 100644
--- a/Documentation/sound/alsa/HD-Audio-Models.txt
+++ b/Documentation/sound/alsa/HD-Audio-Models.txt
@@ -58,12 +58,7 @@
 
 ALC267/268
 ==========
-  quanta-il1	Quanta IL1 mini-notebook
-  3stack	3-stack model
-  test		for testing/debugging purpose, almost all controls can
-		adjusted.  Appearing only when compiled with
-		$CONFIG_SND_DEBUG=y
-  auto		auto-config reading BIOS (default)
+  N/A
 
 ALC269
 ======