Make libhidl_gtest_helper vendor_available. am: d17de9f5a5

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/libhidl/+/18453726

Change-Id: I6bd30bf92f3e9303036287664785b9aa0d958751
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/Android.bp b/Android.bp
index c5d129e..bd7c1a8 100644
--- a/Android.bp
+++ b/Android.bp
@@ -48,6 +48,7 @@
 
 cc_library_headers {
     name: "libhidl_gtest_helper",
+    vendor_available: true,
     host_supported: true,
     export_include_dirs: ["gtest_helper"],
 }