C++20 is the default now.

Change-Id: I311f793a8975892e61c8fae559a2c28d95b840f3
diff --git a/services/incremental/Android.bp b/services/incremental/Android.bp
index ce05c82..101f70f 100644
--- a/services/incremental/Android.bp
+++ b/services/incremental/Android.bp
@@ -24,7 +24,6 @@
 cc_defaults {
     name: "service.incremental-proto-defaults",
 
-    cpp_std: "c++2a",
     proto: {
         type: "lite",
     },