BOSTON—Enes Freedom will now be linked forever to a word he says he fought for his entire life. The Boston Celtics center changed his name from Enes Kanter to Enes Kanter Freedom in celebration of him officially becoming a United States citizen on Monday. ADVERTISEMENT He said Tuesday that taking the citizenship oath was “maybe the most unforgettable moment that I had in my life.” Kanter, 29, is a native of Turkey who has been an outspoken critic of President Recep Tayyip Erdoğan and the Turkish government. The 2011 first-round draft pick has also taken to social media to support Tibetan indep…