By Daniel Bates Last season, serious questions surrounded Lakers big man Anthony Davis and his work ethic and commitment. Davis reportedly came into camp out of shape, and after an injury-filled season that saw him play only 40 games, the eight-time All-Star admitted that he hadn’t touched a basketball since April. Now famed NBA shooting coach Chris “Lethal Shooter” Matthews is back in the lab with AD, saying that the 29-year-old is “locked in.” “Anthony Davis been locked in!” the trainer tweeted. “Training everyday at 4:50am is what it takes! After 400makes, FT’s are key! To be the best if yo…