Update Android.bp by running cargo_embargo

Test: ran cargo_embargo
Change-Id: I99e69eeab1715d56ea65f5009eb977827c5b5456
diff --git a/Android.bp b/Android.bp
index 5d851e4..f9f17e4 100644
--- a/Android.bp
+++ b/Android.bp
@@ -45,7 +45,7 @@
     crate_name: "libc",
     cargo_env_compat: true,
     cargo_pkg_version: "0.2.153",
-    srcs: ["src/lib.rs"],
+    crate_root: "src/lib.rs",
     edition: "2015",
     features: [
         "default",