* intermediate hierarchical ports do not inherit CONFIG values or
    other properties from their sources
  * e.g., CONFIG.DATA_WIDTH is not set on master ports, preventing
    detection of the interface width
  * implemented new common method: tapasco::get_aximm_property
  * will travel down to original master(s) and report the value of the
    given property from there; will raise an error if multiple,
    differing values are found
  * used in axi4mm Architecture