ALSA: hda/ca0132 - Add bool variable to enable/disable pci region2 mmio

This patch adds the ability to choose whether or not to map the pci
region2, which is used for things such as GPIO on the Recon3D and Sound
Blaster Z.

Signed-off-by: Connor McAdams <conmanx360@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>