Forward timestamps back from the pi to the roboRIO

This makes it so log reading can actually estimate the time offest of
the pi's and replay log files with pi data in them.

Change-Id: I15b9c53f5a49ef93bd562f208fa2b6b0fbec05c7
diff --git a/y2020/BUILD b/y2020/BUILD
index 4643ae8..59642fe 100644
--- a/y2020/BUILD
+++ b/y2020/BUILD
@@ -210,6 +210,7 @@
     src = "y2020_roborio.json",
     flatbuffers = [
         ":setpoint_fbs",
+        "//aos/events/logging:logger_fbs",
         "//aos/network:message_bridge_client_fbs",
         "//aos/network:message_bridge_server_fbs",
         "//aos/network:timestamp_fbs",