[ALSA] hda-codec - Fix support of laptops with AD1986A codec

Modules: Documentation,HDA Codec driver

Fix the support of laptops with AD1986A HD-audio codec.
Added new models '3stack' and 'laptop'.  Currently, fixed for FSC V2060
and Samsung M50.

Also fixed the description of missing models in ALSA-Configuration.txt.

Signed-off-by: Takashi Iwai <tiwai@suse.de>