Trim fat from pork; cut into 1-inch pieces. Lightly spoon flour into a dry measuring cup; level with a knife. Combine flour and pork in a zip-top plastic bag; seal and shake well.
Heat 1 tablespoon oil in a large nonstick skillet over medium-high heat. Add pork; cook 3 minutes or until browned. Remove from pan; keep warm.
Add 1 tablespoon oil to pan. Add bok choy and next 5 ingredients (bok choy through garlic); stir-fry 3 minutes. Combine broth, soy sauce, cornstarch, sherry, and ginger; stir well with a whisk. Add pork and broth mixture to pan; cook 1 minute or until thick. Serve over rice; sprinkle with green onions.