Make document-features available to product and vendor

Bug: 270690570

Test: mma in external/rust/crates
Change-Id: I852cf4bc18e439283d9d390c1b165fb85a9967e2
diff --git a/Android.bp b/Android.bp
index c5a14fd..2066781 100644
--- a/Android.bp
+++ b/Android.bp
@@ -50,4 +50,6 @@
     rustlibs: [
         "liblitrs",
     ],
+    product_available: true,
+    vendor_available: true,
 }