platforms: remove old lockstep functionality

These functions won't be used any longer with the new implementation.

src/lib/cdev/posix/cdev_platform.cpp

@@ -522,30 +522,4 @@ extern "C" {
 		pthread_mutex_unlock(&devmutex);
 	}
 
-	void px4_enable_sim_lockstep()
-	{
-		px4_sem_init(&lockstep_sem, 0, 0);
-
-		// lockstep_sem use case is a signal
-		px4_sem_setprotocol(&lockstep_sem, SEM_PRIO_NONE);
-
-		sim_lockstep = true;
-		sim_delay = false;
-	}
-
-	void px4_sim_start_delay()
-	{
-		sim_delay = true;
-	}
-
-	void px4_sim_stop_delay()
-	{
-		sim_delay = false;
-	}
-
-	bool px4_sim_delay_enabled()
-	{
-		return sim_delay;
-	}
-
 } // extern "C"

src/modules/uORB/uORBDeviceNode.cpp

@@ -590,12 +590,6 @@ out:
 bool
 uORB::DeviceNode::appears_updated(SubscriberData *sd)
 {
-
-	/* block if in simulation mode */
-	while (px4_sim_delay_enabled()) {
-		px4_usleep(100);
-	}
-
 	/* assume it doesn't look updated */
 	bool ret = false;
 

src/platforms/px4_posix.h

@@ -108,11 +108,6 @@ __EXPORT int		px4_fsync(int fd);
 __EXPORT int		px4_access(const char *pathname, int mode);
 __EXPORT px4_task_t	px4_getpid(void);
 
-__EXPORT void		px4_enable_sim_lockstep(void);
-__EXPORT void		px4_sim_start_delay(void);
-__EXPORT void		px4_sim_stop_delay(void);
-__EXPORT bool		px4_sim_delay_enabled(void);
-
 __END_DECLS
 #else
 #error "No TARGET OS Provided"