Add avf_build_flags_rust defaults to all rust_ modules

Bug: 298008251
Bug: 298012279
Bug: 298007909
Bug: 298008232
Test: builds
Test: presubmit
Change-Id: I5194d7043d5ac60b34162399557b3b657ead8969
diff --git a/microdroid/payload/config/Android.bp b/microdroid/payload/config/Android.bp
index 7e60cd4..4c72b97 100644
--- a/microdroid/payload/config/Android.bp
+++ b/microdroid/payload/config/Android.bp
@@ -6,6 +6,7 @@
     name: "libmicrodroid_payload_config",
     host_supported: true,
     crate_name: "microdroid_payload_config",
+    defaults: ["avf_build_flags_rust"],
     srcs: ["src/lib.rs"],
     prefer_rlib: true,
     edition: "2021",