Update Virtualization module to protobuf3.

Test: manual atest
Bug: 286984317
Change-Id: Ie338092ae1196bfd260831352312cbd97f6b28e1
diff --git a/microdroid/payload/Android.bp b/microdroid/payload/Android.bp
index 4814a64..8225875 100644
--- a/microdroid/payload/Android.bp
+++ b/microdroid/payload/Android.bp
@@ -31,6 +31,7 @@
     protos: ["metadata.proto"],
     source_stem: "microdroid_metadata",
     host_supported: true,
+    use_protobuf3: true,
     apex_available: [
         "com.android.virt",
     ],