[iOS] Update region types
[iOS] Update region types

mybigday/react-native-s3,mybigday/react-native-s3,nharlow89/react-native-s3,mybigday/react-native-s3,nharlow89/react-native-s3,mybigday/react-native-s3,nharlow89/react-native-s3,nharlow89/react-native-s3