Heat oil in heavy large pot over medium-high heat. Add 1 3/4 cups onions, 2 garlic cloves and bay leaves; sauté 5 minutes. Add broth, tomatoes with juices, salsa and 1/4 cup cilantro; bring to boil. Cover and simmer 15 minutes.
Meanwhile, combine ground beef, pork sausage, cornmeal, whole milk, egg, salt, pepper, cumin, then remaining 1 cup onions, 2 garlic cloves and 1/4 cup cilantro in medium bowl. Mix well. Shape meat mixture by generous tablespoonfuls into 1- to 1 1/4-inch balls. Add rice and meatballs to soup and bring to boil, stirring occasionally. Reduce heat, cover and simmer until rice and meatballs are tender, stirring occasionally, about 20 minutes. Season to taste with salt and pepper. Ladle soup into bowls and serve.