By Sergio Goncalves LISBON (Reuters) – Eight Portuguese and foreign entities have expressed interest in buying a 71.7% stake in engineering firm Efacec, once owned by Angolan businesswoman Isabel dos Santos and nationalised in 2020, state holding company Parpublica said on Tuesday. Portugal nationalised the majority stake in Efacec Power Solutions in July 2020 after Dos Santos, the daughter of former Angolan President Jose Eduardo dos Santos, became a suspect in a fraud investigation in Angola and her bank accounts in Portugal were seized. Dos Santos, who held significant stakes in several oth…