Jem Aswad Senior Music EditorIn the days after DMX’s death from a heart attack last month, several people close to the veteran rapper said that he recently had completed a new studio album, but did not provide further details.Some details arrived on Monday from his longtime friend and producer, Swizz Beatz: “Exodus,” an album of all-new original material, will arrive on May 28 via Ruff Ryders and Def Jam Recordings, the home of his most successful recordings, with whom he signed a new deal in