Make serde-xml-rs available to product and vendor

Bug: 270690570

Test: mma in external/rust/crates
Change-Id: Ib6be48d4a1421d2f6e4daabfdbf214e601e62668
diff --git a/Android.bp b/Android.bp
index f8add92..3a2d26c 100644
--- a/Android.bp
+++ b/Android.bp
@@ -36,6 +36,8 @@
         "//apex_available:platform",
         "com.android.virt",
     ],
+    product_available: true,
+    vendor_available: true,
 }
 
 rust_test {