[ALSA] hda-codec - Add model=mobile for AD1884A & co

Added the new model mobile for AD1884A and compatible codecs.
It's a reduced version of model=laptop.

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 bfc6d48..2cfb8b4 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -915,6 +915,7 @@
 	AD1884A / AD1883 / AD1984A / AD1984B
 	  desktop	3-stack desktop (default)
 	  laptop	laptop with HP jack sensing
+	  mobile	mobile devices with HP jack sensing
 
 	AD1884
 	  N/A