Add 2019 field target locations

Change-Id: Ie3ac15f4de3f4f2f97b88a7160c3a02d65d41740
diff --git a/y2019/control_loops/drivetrain/BUILD b/y2019/control_loops/drivetrain/BUILD
index 959e839..38c73f0 100644
--- a/y2019/control_loops/drivetrain/BUILD
+++ b/y2019/control_loops/drivetrain/BUILD
@@ -84,6 +84,7 @@
 cc_library(
     name = "camera",
     srcs = ["camera.h"],
+    visibility = ["//y2019:__pkg__"],
     deps = [
         "//aos/containers:sized_array",
         "//frc971/control_loops:pose",