Convert license to SPDX format
    
    This new expression is a result of
    
     * Running 'licensecheck -r .' across the QEMU code base
     * Ignoring results not applicable to Fedora platform
     * Ignoring stuff only used in test cases
     * Adding missing logo license
     * Considering upstream default license for non-annotated files
    
    Note license expression simplication is no longer to be performed in
    Fedora, so the new expression is unavoidably much larger than before.
    
    Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>