Moved DrivetrainWriter from y2016

Change-Id: Iac26290494b2640e091b6c19dfa3e2a99e95a8dc
diff --git a/y2016/BUILD b/y2016/BUILD
index 9c9afeb..1a00044 100644
--- a/y2016/BUILD
+++ b/y2016/BUILD
@@ -92,6 +92,7 @@
         "//frc971/wpilib:buffered_pcm",
         "//frc971/wpilib:dma",
         "//frc971/wpilib:dma_edge_counting",
+        "//frc971/wpilib:drivetrain_writer",
         "//frc971/wpilib:encoder_and_potentiometer",
         "//frc971/wpilib:gyro_sender",
         "//frc971/wpilib:interrupt_edge_counting",