Make getrandom available to product and vendor

Bug: 270690570

Test: mma in external/rust/crates
Change-Id: I1c47c153189acd17839349852c5b27c8b9e1c459
diff --git a/Android.bp b/Android.bp
index 6686b7e..a23a93d 100644
--- a/Android.bp
+++ b/Android.bp
@@ -110,5 +110,6 @@
         "//apex_available:platform",
         "//apex_available:anyapex",
     ],
+    product_available: true,
     vendor_available: true,
 }