Generate apex_available from c2a instead of a patch

Test: Run c2a
Test: Build
Change-Id: Iafd6984aa1acc8b571367ec44f37f065c1ec68e1
diff --git a/Android.bp b/Android.bp
index d074f9c..8e9044a 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,4 +1,5 @@
-// This file is generated by cargo2android.py --run --device --dependencies --tests --patch=patches/Android.bp.patch.
+// This file is generated by cargo2android.py --config cargo2android.json.
+// Do not modify this file as changes will be overridden on upgrade.
 
 package {
     default_applicable_licenses: [