Converted drivetrain to codegen coeffs at buildtime

Change-Id: I41a77751f71d2f990ac49b19c85bc166b10a563b
diff --git a/y2015_bot3/control_loops/drivetrain/drivetrain.cc b/y2015_bot3/control_loops/drivetrain/drivetrain.cc
index a3e7c24..81a4be5 100644
--- a/y2015_bot3/control_loops/drivetrain/drivetrain.cc
+++ b/y2015_bot3/control_loops/drivetrain/drivetrain.cc
@@ -143,7 +143,7 @@
 
   DrivetrainMotorsSS()
       : loop_(new LimitedDrivetrainLoop(
-            ::y2015_bot3::control_loops::MakeDrivetrainLoop())),
+            ::y2015_bot3::control_loops::drivetrain::MakeDrivetrainLoop())),
         filtered_offset_(0.0),
         gyro_(0.0),
         left_goal_(0.0),