Move ExactCalculator to androidx.

Bug: 76692459
Test: make -j ExactCalculator and run on emulator
Change-Id: I6d52a233696d41d43fdaabf6863f359c79e4b4f7
diff --git a/src/com/android/calculator2/CalculatorResult.java b/src/com/android/calculator2/CalculatorResult.java
index d2ba9a8..8fa698b 100644
--- a/src/com/android/calculator2/CalculatorResult.java
+++ b/src/com/android/calculator2/CalculatorResult.java
@@ -23,9 +23,9 @@
 import android.content.Context;
 import android.graphics.Rect;
 import android.os.Build;
-import android.support.annotation.IntDef;
-import android.support.v4.content.ContextCompat;
-import android.support.v4.os.BuildCompat;
+import androidx.annotation.IntDef;
+import androidx.core.content.ContextCompat;
+import androidx.core.os.BuildCompat;
 import android.text.Layout;
 import android.text.Spannable;
 import android.text.SpannableString;