Backport - Setting CIP_FLG_TREAT_NOTIFY is broken for all non-NV and all variable size attributes

When the user sets that attribute flag he shall receive a change indication for the attribute on chnage. He can accept or reject the change. The client will then receive an appropriate status code (SUCCESS or CIP_GSR_SERVICE_ERROR).

Unfortunately, if an attribute is flagged which is not in the NV data block client will always reeive back an error status and the new attribute value will not be taken over. The same applies for variable length attributes. like EtherNetLink's attrbute 10 or Assembly's attribute 3.