[ALSA] Add model entry for Clevo m665n laptop

Added the proper model entry for Clevo m665n laptop with ALC880 codec.
Also, added a model string 'clevo' to enable the clevo-type model option.

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