[ALSA] hda-codec - Add AD1884 / AD1984 codec support

Added the support of AD1884 and AD1984 codec chips.
Also experimental quirks for Thinkpad T61/X61 laptops with AD1984.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

Documentation/sound/alsa/ALSA-Configuration.txt

@@ -864,12 +864,22 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
 	  allout	5-jack in back, 2-jack in front, SPDIF out
 	  auto		auto-config reading BIOS (default)
 
+	AD1884
+	  N/A
+
 	AD1981
 	  basic		3-jack (default)
 	  hp		HP nx6320
 	  thinkpad	Lenovo Thinkpad T60/X60/Z60
 	  toshiba	Toshiba U205
 
+	AD1983
+	  N/A
+
+	AD1984
+	  basic		default configuration
+	  thinkpad	Lenovo Thinkpad T61/X61
+
 	AD1986A
 	  6stack	6-jack, separate surrounds (default)
 	  3stack	3-stack, shared surrounds