Updated wpilib interface and constants.

Updated files for robot to handle drivetrain.

Change-Id: I6743c58b52027a4114b14032972a4f6e29a25cb3
diff --git a/y2019/BUILD b/y2019/BUILD
index 7c987f6..2b9d39b 100644
--- a/y2019/BUILD
+++ b/y2019/BUILD
@@ -13,6 +13,7 @@
         "//aos/mutex",
         "//aos/network:team_number",
         "//frc971:constants",
+        "//y2019/control_loops/drivetrain:polydrivetrain_plants",
     ],
 )
 
@@ -23,6 +24,7 @@
     ],
     restricted_to = ["//tools:roborio"],
     deps = [
+        ":constants",
         "//aos:init",
         "//aos:make_unique",
         "//aos:math",