Split joystick_reader into hardware shim + application.

Change-Id: If31e6dd7ece547a2952ec21e2f4bc745ee6f9d84
diff --git a/aos/common/input/input.gyp b/aos/common/input/input.gyp
index e5c964c..7d5af30 100644
--- a/aos/common/input/input.gyp
+++ b/aos/common/input/input.gyp
@@ -8,9 +8,11 @@
       ],
       'dependencies': [
         '<(EXTERNALS):WPILib-NetworkRobotValues',
+        '<(AOS)/common/messages/messages.gyp:robot_state',
       ],
       'export_dependent_settings': [
         '<(EXTERNALS):WPILib-NetworkRobotValues',
+        '<(AOS)/common/messages/messages.gyp:robot_state',
       ],
     },
   ],