[ALSA] Add description of imac-intel model

Added the description of missing imac-intel model for hda-intel driver.

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 62f9e4c..d18e12b 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -909,6 +909,7 @@
 	  macbook	Intel Mac Book
 	  macbook-pro-v1 Intel Mac Book Pro 1st generation
 	  macbook-pro	Intel Mac Book Pro 2nd generation
+	  imac-intel	Intel iMac
 
 	STAC9202/9250/9251
 	  ref		Reference board, base config