Move com.android.cts.helpers.aosp to data so it's packaged automatically

Change-Id: I359dbf9adab003b822a2b74f6a3b942e6d594327
Test: presubmit
Bug: 269138674

core/tests/coretests/Android.bp

@@ -84,8 +84,8 @@ android_test {
         ":BstatsTestApp",
         ":BinderDeathRecipientHelperApp1",
         ":BinderDeathRecipientHelperApp2",
+        ":com.android.cts.helpers.aosp",
     ],
-    required: ["com.android.cts.helpers.aosp"],
 }
 
 // Rules to copy all the test apks to the intermediate raw resource directory