Settings Fragment Migration (Build pass app)

This patch focused on fixing compile errors and some runtime errors.

Test: We can't test it now. But we will have an integration test later.
Bug: 110259478
Change-Id: I16c471ddcd0fa1460c665b7f74d86fcace5ee67b

src/com/android/settings/wifi/calling/WifiCallingSettings.java

@@ -38,7 +38,7 @@ import java.util.List;
 
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;
-import androidx.legacy.app.FragmentPagerAdapter;
+import androidx.fragment.app.FragmentPagerAdapter;
 
 /**
  * "Wi-Fi Calling settings" screen. This is the container fragment which holds