ALSA: hda - Add support of HP DC7600

Fixed the support of HP DC7600 with ALC260, which was formerly handled
as model=hp-3013.

Signed-off-by: Kailang Yang <kailang@realtek.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>