Move ExactCalculator to androidx.

Bug: 76692459
Test: make -j ExactCalculator and run on emulator
Change-Id: I6d52a233696d41d43fdaabf6863f359c79e4b4f7
diff --git a/src/com/android/calculator2/DragLayout.java b/src/com/android/calculator2/DragLayout.java
index 3264b73..e34c4da 100644
--- a/src/com/android/calculator2/DragLayout.java
+++ b/src/com/android/calculator2/DragLayout.java
@@ -24,8 +24,8 @@
 import android.graphics.Rect;
 import android.os.Bundle;
 import android.os.Parcelable;
-import android.support.v4.view.ViewCompat;
-import android.support.v4.widget.ViewDragHelper;
+import androidx.core.view.ViewCompat;
+import androidx.customview.widget.ViewDragHelper;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
 import android.view.View;