docs: def bios_mappings(self):
          """Property to provide reference to bios mappings instance
  
          It is calculated once when the first time it is queried. On refresh,
          this property gets reset.
          """
          return BIOSMappings(
              self._conn, utils.get_subresource_path_by(
                  self, ["Oem", "Hpe", "Links", "Mappings"]),
              redfish_version=self.redfish_version)