Update Android.bp to reflect aosp/2763825

Test: Ran cargo2android. Treehugger.
Change-Id: Ib46057ff6a4bc41d1245ba4c793c760dc9d5bf6d
diff --git a/Android.bp b/Android.bp
index 3af481e..36ef473 100644
--- a/Android.bp
+++ b/Android.bp
@@ -49,8 +49,6 @@
         "libgrpcio_compiler",
         "libprotobuf_deprecated",
     ],
-    product_available: true,
-    vendor_available: true,
 }
 
 rust_library_host {
@@ -68,6 +66,4 @@
     rustlibs: [
         "libprotobuf_deprecated",
     ],
-    product_available: true,
-    vendor_available: true,
 }