actions and control loops: frc971 shall depend on aos

And not the other way around.

Define the loop frequency in actor.h and use that in
control_loop.h.  Fix dependencies (and add missing dependency of
actor on event_loop).

Signed-off-by: Stephan Pleines <pleines.stephan@gmail.com>
Change-Id: Ieec0b3eb1c66737e1ed19e6bdee40655524f4016
diff --git a/frc971/control_loops/BUILD b/frc971/control_loops/BUILD
index 1c1b797..925dd43 100644
--- a/frc971/control_loops/BUILD
+++ b/frc971/control_loops/BUILD
@@ -84,6 +84,7 @@
     ],
     target_compatible_with = ["@platforms//os:linux"],
     deps = [
+        "//aos/actions:action_lib",
         "//aos/events:event_loop",
         "//aos/events:shm_event_loop",
         "//aos/logging",