ALSA: hda/ca0132 - Call pci_iounmap() instead of iounmap()

We need to call pci_iounmap() instead of iounmap() for the regions
obtained via pci_iomap() call for some archs that need special
treatment.

Fixes: aa31704f ("ALSA: hda/ca0132: Add PCI region2 iomap for SBZ")
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>