Account for socketcan providing realtime timestamps

We are getting realtime timestamps back, but were treating them as
monotonic times. Fix that.

Change-Id: Ib92ced05870dcfa7a476ce2509b28eb307bda5ac
Signed-off-by: James Kuszmaul <jabukuszmaul+collab@gmail.com>
diff --git a/frc971/can_logger/can_logging.fbs b/frc971/can_logger/can_logging.fbs
index ba60241..c7a82f2 100644
--- a/frc971/can_logger/can_logging.fbs
+++ b/frc971/can_logger/can_logging.fbs
@@ -7,7 +7,7 @@
   // The body of the CAN frame up to 64 bytes long.
   data:[ubyte] (id: 1);
   // The hardware timestamp of when the frame came in
-  monotonic_timestamp_ns:uint64 (id: 2);
+  realtime_timestamp_ns:uint64 (id: 2);
   // Additional flags for CAN FD
   flags: ubyte (id: 3);
 }