Update Android.bp by running cargo_embargo

Test: ran cargo_embargo
Change-Id: I47e61a58e29b5b0bbe363802c984c671931ae298
diff --git a/Android.bp b/Android.bp
index 62a7c18..b3177ff 100644
--- a/Android.bp
+++ b/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.
 
 rust_library {
     name: "libutf8",
@@ -7,7 +9,7 @@
     crate_name: "utf8",
     cargo_env_compat: true,
     cargo_pkg_version: "0.7.6",
-    srcs: ["src/lib.rs"],
+    crate_root: "src/lib.rs",
     edition: "2015",
     apex_available: [
         "//apex_available:platform",
@@ -23,7 +25,7 @@
     crate_name: "unit",
     cargo_env_compat: true,
     cargo_pkg_version: "0.7.6",
-    srcs: ["tests/unit.rs"],
+    crate_root: "tests/unit.rs",
     test_suites: ["general-tests"],
     auto_gen_config: true,
     test_options: {