Add second transfer roller motor

Still use same behavior of always sending opposite voltages

Signed-off-by: Milind Upadhyay <milind.upadhyay@gmail.com>
Change-Id: If6bcf617db37b40924556d59dcfa23e7d43bdef1
diff --git a/y2022/control_loops/superstructure/superstructure_output.fbs b/y2022/control_loops/superstructure/superstructure_output.fbs
index 8fa992e..af6c292 100644
--- a/y2022/control_loops/superstructure/superstructure_output.fbs
+++ b/y2022/control_loops/superstructure/superstructure_output.fbs
@@ -26,8 +26,8 @@
   // positive is pulling into the robot
   roller_voltage_front:double (id: 6);
   roller_voltage_back:double (id: 7);
-  // One transfer motor for both sides
-  transfer_roller_voltage:double (id: 8);
+  transfer_roller_voltage_front:double (id: 8);
+  transfer_roller_voltage_back:double (id: 9);
 }
 
 root_type Output;