West Marin fans will have to wake up early if they want to watch Savilia Blunk compete in the Olympic Games this weekend. The Inverness native’s cross-country mountain bike race starts Sunday morning at 5 a.m. Pacific time. Ms. Blunk, who has been a top-ranked cyclist since high school, is hoping to become the second Marin County woman to win an Olympic medal and the first from West Marin. Susan DeMattei, who grew up in…