Generate apex_available from c2a instead of a patch

Test: Run c2a
Test: Build
Change-Id: I4222ffbfd1b11fce1bd6ce15be122b0f5e31a6c7
diff --git a/Android.bp b/Android.bp
index 539722d..cab84c6 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: ["external_rust_crates_untrusted_license"],
@@ -19,6 +20,7 @@
 
 rust_library {
     name: "libuntrusted",
+    // has rustc warnings
     host_supported: true,
     crate_name: "untrusted",
     srcs: ["src/untrusted.rs"],
@@ -33,6 +35,7 @@
 rust_defaults {
     name: "untrusted_defaults",
     crate_name: "untrusted",
+    // has rustc warnings
     srcs: ["src/untrusted.rs"],
     test_suites: ["general-tests"],
     auto_gen_config: true,
@@ -42,6 +45,9 @@
 rust_test_host {
     name: "untrusted_host_test_src_untrusted",
     defaults: ["untrusted_defaults"],
+    test_options: {
+        unit_test: true,
+    },
 }
 
 rust_test {
@@ -52,6 +58,7 @@
 rust_defaults {
     name: "untrusted_defaults_tests",
     crate_name: "tests",
+    // has rustc warnings
     srcs: ["tests/tests.rs"],
     test_suites: ["general-tests"],
     auto_gen_config: true,
@@ -64,6 +71,9 @@
 rust_test_host {
     name: "untrusted_host_test_tests_tests",
     defaults: ["untrusted_defaults_tests"],
+    test_options: {
+        unit_test: true,
+    },
 }
 
 rust_test {