Starbucks Corp will use its ubiquitous coffee cups to tell US lawmakers to come up with a deal to avoid going over the “fiscal cliff” and triggering automatic tax hikes and spending cuts. Chief Executive Howard Schultz is urging workers in Starbucks’ roughly 120 Washington-area shops to write “come together” on customers’ cups on Thursday and Friday, as President Obama and lawmakers return to work and attempt to revive fiscal cliff negotiations that collapsed before the Christmas holiday.