ALSA: hda/cirrus - support for iMac12,2 model

This early 2011 model just need to have headphones on GPI02
instead of GPI01, and use BIOS pincfgs.
It is detected by codec SSID.
The iMac12,1 model is known to work the same way, although maybe
not with the same codec SSID.

Signed-off-by: Jérémy Lal <kapouer@melix.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>