px4io driver: force failsafe depending on actuator armed

src/modules/uORB/topics/actuator_armed.h

@@ -56,6 +56,7 @@ struct actuator_armed_s {
 	bool		armed;		/**< Set to true if system is armed */
 	bool		ready_to_arm;	/**< Set to true if system is ready to be armed */
 	bool		lockdown;	/**< Set to true if actuators are forced to being disabled (due to emergency or HIL) */
+	bool		force_failsafe; /**< Set to true if the actuators are forced to the failsafe position */
 };
 
 /**
@@ -65,4 +66,4 @@ struct actuator_armed_s {
 /* register this as object request broker structure */
 ORB_DECLARE(actuator_armed);
 
-#endif
+#endif