Move ExactCalculator to androidx.

Bug: 76692459
Test: make -j ExactCalculator and run on emulator
Change-Id: I6d52a233696d41d43fdaabf6863f359c79e4b4f7
diff --git a/src/com/android/calculator2/HistoryAdapter.java b/src/com/android/calculator2/HistoryAdapter.java
index 629abe9..be50050 100644
--- a/src/com/android/calculator2/HistoryAdapter.java
+++ b/src/com/android/calculator2/HistoryAdapter.java
@@ -16,7 +16,7 @@
 
 package com.android.calculator2;
 
-import android.support.v7.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;