ALC268 has different NIDs from ALC262.  Acer model should use NID 0x02 and
0x03 instead of 0x0c and 0x0d for the master volume.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>