MILWAUKEE (AP) – A Milwaukee driver whose passenger was killed in a single-vehicle crash has been charged with homicide by intoxicated use of a vehicle.        Twenty-five-year-old Christopher Joseph Allen was also charged Wednesday with three other felonies, including charges of injury by intoxicated use of a vehicle.    Prosecutors say a witness found Allen early Sunday morning behind the wheel of a car that had crashed into a tree. Police found Aaron Calvin dead in the back seat, and a medical examiner says his injuries were consistent with being involved in a traffic accident.  A second passenger suffered a broken hip and other injuries.   Prosecutors say Allen had a blood-alcohol level of 0.12 percent, or 1 1/2 times the legal limit for driving.   Online court records did not immediately list a defense attorney Wednesday.