Remove unused mfaOption property from CognitoUserAttributes class (#1121)

Author: desokroshan

CHANGELOG.md

@@ -13,6 +13,7 @@
   - Removed deprecated SDKGlobalConfiguration options:
     - `ENABLE_S3_SIGV4_SYSTEM_PROPERTY`
     - `ENFORCE_S3_SIGV4_SYSTEM_PROPERTY`
+- Remove unused `mfaOption` property from `CognitoUserAttributes` class
 
 ### Bug Fixes
 

aws-android-sdk-cognitoidentityprovider/src/main/java/com/amazonaws/mobileconnectors/cognitoidentityprovider/CognitoUserAttributes.java

@@ -33,9 +33,6 @@ public class CognitoUserAttributes {
      */
     private Map<String, String> userAttributes;
 
-    // Multi-factor authentication options set for a user
-    private Map<String, String> mfaOptions;
-
     /**
      * Public constructor, creates an "empty container".
      * Use {@link CognitoUserAttributes#addAttribute(String, String)} method to add user attributes.