Kill target_selector_hint queue

Use EventLoop instead.

Change-Id: I84f839e6ec247648470c70be234611517dff8f51
diff --git a/y2019/control_loops/drivetrain/BUILD b/y2019/control_loops/drivetrain/BUILD
index 8cfa45e..845575f 100644
--- a/y2019/control_loops/drivetrain/BUILD
+++ b/y2019/control_loops/drivetrain/BUILD
@@ -147,6 +147,7 @@
     srcs = ["target_selector_test.cc"],
     deps = [
         ":target_selector",
+        "//aos/events:shm-event-loop",
         "//aos/testing:googletest",
         "//aos/testing:test_shm",
     ],