audio: intel-hda: do not use old_mmio accesses

intel-hda is currently using the old_mmio accessors for io.
This updates the device to use .read and .write accessors instead.

Signed-off-by: Matt Parker <mtparkr@gmail.com>
Message-id: 20170827192038.28930-1-mtparkr@gmail.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>