Cleanup license metadata in external/rust/crates/googletest.

Add package and license module in Android.bp. File LICENSE is from upstream project, so use it in Android.bp.

Bug: 346390141
Change-Id: If519250a9463781db683632e5a14e7d9f6218668
Test: CIs
diff --git a/Android.bp b/Android.bp
index 3afe244..b849242 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,7 +1,16 @@
 // 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_googletest_license"],
+}
+
+license {
+    name: "external_rust_crates_googletest_license",
+    visibility: [":__subpackages__"],
+    license_kinds: ["SPDX-license-identifier-Apache-2.0"],
+    license_text: ["LICENSE"],
+}
 
 rust_library {
     name: "libgoogletest_rust",
diff --git a/cargo_embargo.json b/cargo_embargo.json
index bccaabe..ba25625 100644
--- a/cargo_embargo.json
+++ b/cargo_embargo.json
@@ -1,4 +1,9 @@
 {
+  "package": {
+    "googletest": {
+      "license_text": "LICENSE"
+    }
+  },
   "module_name_overrides": {
     "libgoogletest": "libgoogletest_rust"
   },