Brian Steinberg Senior TV EditorDebt-laden AT&T is considering a possible sale of the digital-advertising assets it assembled as it prepared to acquire the former Time Warner for around $85 billion in 2018, according to a report in The Wall Street Journal, a sign of diminishing ambitions in that particular arena.AT&T in 2017 launched a separate unit devoted to assembling data, analytics and advertising opportunities, mainly using consumer information from its massive DirecTV