Added Drivetrain Writer.

Moved drivetrain writer out of year specific, started with changing
2019.

Change-Id: Id4738f4fe04ec390fb5d0a983a5597f1064b04db
diff --git a/y2019/BUILD b/y2019/BUILD
index 2b9d39b..9421a11 100644
--- a/y2019/BUILD
+++ b/y2019/BUILD
@@ -41,7 +41,7 @@
         "//frc971/control_loops:queues",
         "//frc971/control_loops/drivetrain:drivetrain_queue",
         "//frc971/wpilib:ADIS16448",
-        "//frc971/wpilib:buffered_pcm",
+        "//frc971/wpilib:drivetrain_writer",
         "//frc971/wpilib:encoder_and_potentiometer",
         "//frc971/wpilib:interrupt_edge_counting",
         "//frc971/wpilib:joystick_sender",