[ALSA] hda-codec - Add quirk entry for Casper CPR2000

Added the quirk entry for Casper CPR2000 (model=acer) with ALC268 codec
(ALSA bug#3343).

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