Re-run cargo_embargo to remove duplicate cfgs.

Test: Looked at output Android.bp.
Change-Id: I29384f5fec81b5a393ab2248deb8ca1a1d8a78ad
diff --git a/Android.bp b/Android.bp
index 5392c60..34999be 100644
--- a/Android.bp
+++ b/Android.bp
@@ -39,10 +39,7 @@
         "std",
         "tree_index",
     ],
-    cfgs: [
-        "mls_build_async",
-        "mls_build_async",
-    ],
+    cfgs: ["mls_build_async"],
     rustlibs: [
         "libcfg_if",
         "libdebug_tree",