NEW YORK (AP) — Sprint is offering DirecTV customers one free year of cellphone service in a bold move aimed at the satellite TV company’s new owner, AT&T.AT&T, which bought DirecTV for $48.5 billion in July, has been promoting a bundle that knocks $10 a month off a combined bill for video and wireless phone service. For a single line, the value of Sprint’s promotion is about $50 a month. It’s Sprint’s way of offering DirecTV customers a bundle without actually owning a video company.Sprint, which is in the midst of a turnaround effort, has been making a range of promotional offers to lure customers.