Upgrade rust/crates/grpcio-compiler to 0.8.0

Test: make
Change-Id: I9dd30e0665a46f584d8bee9ea76353203a2f4341
diff --git a/Android.bp b/Android.bp
index e443d83..b4c976d 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,4 +1,5 @@
 // This file is generated by cargo2android.py --run --dependencies.
+// Do not modify this file as changes will be overridden on upgrade.
 
 package {
     default_applicable_licenses: [
@@ -64,4 +65,4 @@
 }
 
 // dependent_library ["feature_list"]
-//   protobuf-2.18.0
+//   protobuf-2.22.1