Add Flipper Arms Wpilib_Interface

Change-Id: I808519619dc271658666b8060d9903239b809718
Signed-off-by: Griffin Bui <griffinbui+gerrit@gmail.com>
diff --git a/y2022/control_loops/superstructure/superstructure_position.fbs b/y2022/control_loops/superstructure/superstructure_position.fbs
index 38babaf..cd0bc67 100644
--- a/y2022/control_loops/superstructure/superstructure_position.fbs
+++ b/y2022/control_loops/superstructure/superstructure_position.fbs
@@ -9,6 +9,10 @@
   intake_front:frc971.PotAndAbsolutePosition (id: 1);
   intake_back:frc971.PotAndAbsolutePosition (id: 2);
   turret:frc971.PotAndAbsolutePosition (id: 3);
+
+  // Zero is straight and positive is open
+  flipper_arm_left:frc971.RelativePosition (id: 4);
+  flipper_arm_right:frc971.RelativePosition (id: 5);
 }
 
 root_type Position;