Update Android.bp by running cargo_embargo

Test: ran cargo_embargo
Change-Id: I8cb28485d95deaff81bde7476958dab42b8b03ae
diff --git a/Android.bp b/Android.bp
index 9e92976..b5a01dd 100644
--- a/Android.bp
+++ b/Android.bp
@@ -9,7 +9,7 @@
     crate_name: "displaydoc",
     cargo_env_compat: true,
     cargo_pkg_version: "0.2.4",
-    srcs: ["src/lib.rs"],
+    crate_root: "src/lib.rs",
     edition: "2018",
     features: [
         "default",