Generate license header with cargo_embargo.

Bug: 333524428
Test: Ran cargo_embargo, compared Android.bp.
Change-Id: I8a7aa156210cc61c5ba67393f43b0e9997df458c
diff --git a/Android.bp b/Android.bp
index bf4f25f..5709cdb 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,7 +1,5 @@
 // This file is generated by cargo_embargo.
-// 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.
+// Do not modify this file because the changes will be overridden on upgrade.
 
 package {
     default_applicable_licenses: ["external_rust_crates_async-task_license"],
@@ -10,12 +8,8 @@
 license {
     name: "external_rust_crates_async-task_license",
     visibility: [":__subpackages__"],
-    license_kinds: [
-        "SPDX-license-identifier-Apache-2.0",
-    ],
-    license_text: [
-        "LICENSE",
-    ],
+    license_kinds: ["SPDX-license-identifier-Apache-2.0"],
+    license_text: ["LICENSE"],
 }
 
 rust_library {