Olen Steinhauer is a successful spy novel writer (his most recent work is “All the Old Knives”) who is currently producing a television series, “Berlin Station,” for the premium cable channel Epix. This appears to be his first significant work, and for a newcomer, it’s more than solid. “Berlin Station,” which is part of Epix’s first attempt at scripted work (in addition to the politically comedy “Graves”), is a bit…