Added the functions to turn power on and off for the second dynamixel bus in the simulator.

darwin_controller/src/sim/stm32_dyn_master_v2_servos.c

@@ -7,3 +7,11 @@ void darwin_dyn_master_v2_init(void)
   darwin_dyn_master_v2.version=DYN_VER2;
 }
 
+void darwin_dyn_master_v2_enable_power(void)
+{
+}
+
+void darwin_dyn_master_v2_disable_power(void)
+{
+}
+