Generate license header with cargo_embargo. am: 63f2d151d5

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/arrayvec/+/3205896

Change-Id: Ic41f9d2fa630ca5bfc0192384401d2cc78b2baba
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

Android.bp

diff --git a/Android.bp b/Android.bp
index 1205fcc..e25432b 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,9 +1,17 @@
 // 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.
 
-// TODO: Add license.
+package {
+    default_applicable_licenses: ["external_rust_crates_arrayvec_license"],
+}
+
+license {
+    name: "external_rust_crates_arrayvec_license",
+    visibility: [":__subpackages__"],
+    license_kinds: ["SPDX-license-identifier-Apache-2.0"],
+    license_text: ["LICENSE"],
+}
+
 rust_test {
     name: "arrayvec_test_src_lib",
     host_supported: true,