Universal’s first trailer for “Cocaine Bear” gives the people what they want. The title is pretty self-explanatory, even if one doesn’t know about the true-life story involving a 175-pound American black bear who ingested a duffel bag full of blow after the narcotics were dumped out of an airplane by a drug smuggler trying to lighten a heavy load.It’s a somewhat refreshing example of an old-school high-concept movie, one driven by a strong elevator pitch rather than IP or marquee characters.