Re-add integration tests for user switching after STR

Bug: 155520070
Test: atest AndroidCarApiTest:android.car.apitest.CarUserManagerTest -c
Change-Id: Ic987fb193a134b997942cfa3929fde5cefe50ee8
diff --git a/car-test-lib/Android.bp b/car-test-lib/Android.bp
index 965ea7b..4522982 100644
--- a/car-test-lib/Android.bp
+++ b/car-test-lib/Android.bp
@@ -43,5 +43,6 @@
     libs: [
         "android.hardware.automotive.vehicle-V2.0-java",
         "mockito-target-extended",
+        "compatibility-device-util-axt",
     ],
 }