Update Android.bp by running cargo_embargo

Test: ran cargo_embargo
Change-Id: I8e1305247b77a3061815c8fea84831af0f1fcc2d
diff --git a/Android.bp b/Android.bp
index 3425d6d..b74c838 100644
--- a/Android.bp
+++ b/Android.bp
@@ -27,7 +27,7 @@
     crate_name: "async_stream_impl",
     cargo_env_compat: true,
     cargo_pkg_version: "0.3.5",
-    srcs: ["src/lib.rs"],
+    crate_root: "src/lib.rs",
     edition: "2018",
     rustlibs: [
         "libproc_macro2",