[인증][New] 스크롤러 위치 기억

app/src/main/res/layout/sign_up_auth_view.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 
 <android.support.v4.widget.NestedScrollView
+  android:id="@+id/scroll_view"
   xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"