By Rory Carroll INGLEWOOD, Calif. (Reuters) -The Los Angeles Rams rallied late to beat the Cincinnati Bengals 23-20 on Sunday to deliver a Hollywood ending to the Super Bowl, securing the franchise’s first championship since returning to the West Coast six years ago. With his back against the wall, Rams quarterback Matthew Stafford kept his poise to engineer a 15-play drive that ended with a one-yard touchdown pass to Super Bowl MVP Cooper Kupp with 1:25 left to play. Rams defensive lineman Aaron Donald wrapped up Bengals quarterback Joe Burrow on the final play to seal the win under the light…