hw/audio/intel-hda: Restrict DMA engine to memories (not MMIO devices)

Issue #542 reports a reentrancy problem when the DMA engine accesses
the HDA controller I/O registers. Fix by restricting the DMA engine
to memories regions (forbidding MMIO devices such the HDA controller).

Reported-by: OSS-Fuzz (Issue 28435)
Reported-by: Alexander Bulekov <alxndr@bu.edu>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Resolves: qemu-project/qemu#542


CVE: CVE-2021-3611
Message-Id: <20211218160912.1591633-3-philmd@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>