sysbus: add a variant of sysbus_init_mmio_cb with an unmap callback
sysbus_init_mmio_cb() uses the destructive IO_MEM_UNASSIGNED to remove a region. Provide an alternative that calls an unmap callback, so the removal may be done non-destructively. Signed-off-by: NAvi Kivity <avi@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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