LOVELOCK, Nev. — O.J. Simpson once thrilled crowds as he ran for touchdowns and hurdled airport seats in car rental ads to achieve Hollywood celebrity before he was acquitted of murder in the 1995 “trial of the century” in Los Angeles. Now, an aging Simpson will appear as inmate No. 1027820 in a starkly plain hearing room in a remote Nevada prison Thursday to plead for his freedom.