Move aos/controls to frc971/control_loops

Also put what was aos/controls/control_loops.fbs in y2012/control_loops
because that's the only user.

Change-Id: I8f402b0708103077e135a41e55ef5e4f23681d87
Signed-off-by: James Kuszmaul <jabukuszmaul@gmail.com>
diff --git a/y2020/control_loops/drivetrain/BUILD b/y2020/control_loops/drivetrain/BUILD
index 38e00da..4fd61f6 100644
--- a/y2020/control_loops/drivetrain/BUILD
+++ b/y2020/control_loops/drivetrain/BUILD
@@ -140,7 +140,7 @@
     deps = [
         ":drivetrain_base",
         ":localizer",
-        "//aos/controls:control_loop_test",
+        "//frc971/control_loops:control_loop_test",
         "//aos/events:simulated_event_loop",
         "//aos/events/logging:log_writer",
         "//aos/network:team_number",