Refactored HandleDrivetrain from joystick_reader to aos_input.

Change-Id: I4ed796cf90e698ed2198f0da4a2b75e88e28c434
diff --git a/y2017/BUILD b/y2017/BUILD
index 4bf45fa..763e331 100644
--- a/y2017/BUILD
+++ b/y2017/BUILD
@@ -36,6 +36,7 @@
     '//aos/common/util:log_interval',
     '//aos/common:time',
     '//aos/input:joystick_input',
+    '//aos/input:drivetrain_input',
     '//aos/linux_code:init',
     '//frc971/autonomous:auto_queue',
     '//frc971/control_loops/drivetrain:drivetrain_queue',