Update Android.bp by running cargo_embargo

Test: ran cargo_embargo
Change-Id: I31da8f6c06c7acf86ad30de501ad714aa88d8ebe
diff --git a/Android.bp b/Android.bp
index 57e9749..03c3b01 100644
--- a/Android.bp
+++ b/Android.bp
@@ -9,7 +9,7 @@
     crate_name: "darling_macro",
     cargo_env_compat: true,
     cargo_pkg_version: "0.20.8",
-    srcs: ["src/lib.rs"],
+    crate_root: "src/lib.rs",
     edition: "2018",
     rustlibs: [
         "libdarling_core",