Jets legend Joe Namath covered up sexual abuse at his facility, according to court papers filed by a man who says he was assaulted there 51 years ago. Philip Lyle Smith, 64, recently told The Post about his horrific ordeal at a Joe Namath Instructional Football Camp, speaking publicly for the first time about claims he detailed as “John Doe’’ in an ongoing Brooklyn lawsuit. Smith said his alleged sexual predator was well-known Brooklyn Poly Prep Country Club football coach Philip Foglietta, later revealed to be a serial pedophile who abused scores of students at the tony school. Foglietta, who...