Upgrade rust/crates/protobuf to 2.22.1

Test: make
Change-Id: Ie58392a6f5fd045cb0adab0adbe869383d10c198
diff --git a/Android.bp b/Android.bp
index 4aaf259..012442c 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,4 +1,5 @@
 // This file is generated by cargo2android.py --run --dependencies --device --features=bytes --copy-out --patch=patches/Android.bp.patch.
+// Do not modify this file as changes will be overridden on upgrade.
 
 package {
     default_applicable_licenses: ["external_rust_crates_protobuf_license"],
@@ -26,7 +27,6 @@
 
 rust_library {
     name: "libprotobuf",
-    // has rustc warnings
     host_supported: true,
     crate_name: "protobuf",
     srcs: [