[ALSA] hda-intel - Don't try to probe invalid codecs

Fix the max number of codecs detected by HD-intel (and compatible)
controllers to 3.  Some hardware reports extra bits as if
connected, and the driver gets confused to probe unexisting codecs.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>