Update y2020 configs with 5th pi + timestamp channels

Also, update the drivetrain_replay_test to go with it.

Change-Id: Ic88b2f79b14b260e345cfec4f3e5ce3e16a5bd2f
diff --git a/y2020/control_loops/drivetrain/localizer.cc b/y2020/control_loops/drivetrain/localizer.cc
index 3059bf1..32c8834 100644
--- a/y2020/control_loops/drivetrain/localizer.cc
+++ b/y2020/control_loops/drivetrain/localizer.cc
@@ -24,7 +24,7 @@
 }
 
 // Indices of the pis to use.
-const std::array<std::string, 3> kPisToUse{"pi1", "pi2", "pi3"};
+const std::array<std::string, 5> kPisToUse{"pi1", "pi2", "pi3", "pi4", "pi5"};
 
 // Calculates the pose implied by the camera target, just based on
 // distance/heading components.