Use protobuf 2.x instead of 3.x

Ignore-AOSP-First: This will go into AOSP, but needs to be submitted
here because the topic includes internal changes.
Bug: 270895633
Test: build

Change-Id: I3a2fcd73b6d34c4314cc81de25601d9b67e73f70
diff --git a/authfs/Android.bp b/authfs/Android.bp
index 154a1d6..2532026 100644
--- a/authfs/Android.bp
+++ b/authfs/Android.bp
@@ -23,7 +23,7 @@
         "liblog_rust",
         "libnix",
         "libopenssl",
-        "libprotobuf",
+        "libprotobuf_deprecated",
         "librpcbinder_rs",
         "libthiserror",
     ],