ALSA: hda: Use model=mb5 for MacBookPro 5,2

BugLink: https://bugs.launchpad.net/bugs/462098



Until we can look closer at the verbs, let's use ALC885_MB5 for
codec SSID 0x106b4600 to enable playback and capture for MacBookPro
5,2s.

Signed-off-by: Daniel T Chen <crimsun@ubuntu.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>