Since the I/O Bridge device is not implemented,  Use the
TYPE_UNIMPLEMENTED_DEVICE which suits better: if the user
asks for 'unimp' warnings via the -d option then all accesses
will generate logging.
Signed-off-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: NArtyom Tarasenko <atar4qemu@gmail.com>
Message-Id: <20181002212522.23303-10-f4bug@amsat.org>
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>