Update Android.bp by running cargo_embargo

Test: ran cargo_embargo
Change-Id: I56c753a72c56f1842fa32d5c9cb20d9482a2bc05
diff --git a/Android.bp b/Android.bp
index 38926f2..09e59e7 100644
--- a/Android.bp
+++ b/Android.bp
@@ -44,7 +44,7 @@
     crate_name: "num_derive",
     cargo_env_compat: true,
     cargo_pkg_version: "0.3.3",
-    srcs: ["src/lib.rs"],
+    crate_root: "src/lib.rs",
     edition: "2018",
     rustlibs: [
         "libproc_macro2",