LAS VEGAS — All Tito Ortiz wanted was to go out with his head held high, to give his all for 15 final minutes in his illustrious, UFC Hall of Fame career. He didn’t get his hand raised in the end Saturday at the MGM Grand Garden Arena, but it was still mission accomplished. The veteran Ortiz gave everything he had left in his gas tank, but it wasn’t quite enough at UFC 148 as Forrest Griffin scored a unanimous decision in their trilogy fight, winning by scores of 29-28 on all cards. The postfi…