Update Android.bp by running cargo_embargo

Test: ran cargo_embargo
Change-Id: I192ef4f05c061d3d5dc6e2359af85b5511e22b68
diff --git a/2.27.1/Android.bp b/2.27.1/Android.bp
index 35d072b..9e005a9 100644
--- a/2.27.1/Android.bp
+++ b/2.27.1/Android.bp
@@ -1,5 +1,7 @@
 // This file is generated by cargo_embargo.
-// Do not modify this file as changes will be overridden on upgrade.
+// Do not modify this file after the first "rust_*" or "genrule" module
+// because the changes will be overridden on upgrade.
+// Content before the first "rust_*" or "genrule" module is preserved.
 
 package {
     default_applicable_licenses: [
@@ -33,10 +35,8 @@
     crate_name: "protobuf",
     cargo_env_compat: true,
     cargo_pkg_version: "2.27.1",
-    srcs: [
-        "src/lib.rs",
-        ":copy_protobuf_deprecated_build_out",
-    ],
+    crate_root: "src/lib.rs",
+    srcs: [":copy_protobuf_deprecated_build_out"],
     edition: "2018",
     features: ["bytes"],
     rustlibs: ["libbytes"],