INDIANAPOLIS — The gleaming silver and gold Larry Bird Trophy looked like a chalice in Jaylen Brown’s left hand. When Brown was announced as the Eastern Conference finals MVP and the adoring Boston Celtics fans who filled the lower bowl of Gainbridge Fieldhouse roared in approval, Brown didn’t need both mitts to raise that little thing, which looks like a replica of the trophy named after another important Larry. Still, Brown grabbed it near its cylindrical base, sideways, holding it high while teammates palmed his head and slapped him silly.