[ALSA] hda-codec - Add support of newer version of Intel iMac

Added the pin configs for newer version of Intel iMac.
The information provided by Ivan N. Zlatev <contact@i-nz.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 32124bf..bef1352 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -923,6 +923,7 @@
 	  macbook-pro-v1 Intel Mac Book Pro 1st generation
 	  macbook-pro	Intel Mac Book Pro 2nd generation
 	  imac-intel	Intel iMac
+	  imac-intel-20	Intel iMac (newer version)
 
 	STAC9202/9250/9251
 	  ref		Reference board, base config