docs: def _get_rom_firmware_version(self, data):
          """Gets the rom firmware version for server capabilities
  
          Parse the get_host_health_data() to retreive the firmware
          details.
  
          :param data: the output returned by get_host_health_data()
          :returns: a dictionary of rom firmware version.
  
          """
          firmware_details = self._get_firmware_embedded_health(data)
          if firmware_details:
              try:
                  rom_firmware_version = (
                      firmware_details['HP ProLiant System ROM'])
                  return {'rom_firmware_version': rom_firmware_version}
              except KeyError:
                  return None