camera_trigger: remove camera trigger secondary

camera_trigger: publish trigger when capture feedback is not enabled

msg/camera_trigger.msg

@@ -4,4 +4,4 @@ uint64 timestamp_utc # UTC timestamp
 uint32 seq		# Image sequence number
 bool feedback	# Trigger feedback from camera
 
-# TOPICS camera_trigger camera_trigger_secondary
+# TOPICS camera_trigger

src/drivers/camera_trigger/camera_trigger.cpp

@@ -320,8 +320,6 @@ CameraTrigger::CameraTrigger() :
 	if (!_cam_cap_fback) {
 		_trigger_pub = orb_advertise(ORB_ID(camera_trigger), &trigger);
 
-	} else {
-		_trigger_pub = orb_advertise(ORB_ID(camera_trigger_secondary), &trigger);
 	}
 }
 
@@ -846,11 +844,10 @@ CameraTrigger::engage(void *arg)
 	trigger.feedback = false;
 	trigger.timestamp = hrt_absolute_time();
 
+	// Publish only if  _cam_cap_fback is disabled, otherwise, it is published over camera_capture driver
 	if (!trig->_cam_cap_fback) {
 		orb_publish(ORB_ID(camera_trigger), trig->_trigger_pub, &trigger);
 
-	} else {
-		orb_publish(ORB_ID(camera_trigger_secondary), trig->_trigger_pub, &trigger);
 	}
 
 	// increment frame count

src/modules/logger/logged_topics.cpp

@@ -56,7 +56,6 @@ void LoggedTopics::add_default_topics()
 	add_topic("airspeed_validated", 200);
 	add_topic("camera_capture");
 	add_topic("camera_trigger");
-	add_topic("camera_trigger_secondary");
 	add_topic("cellular_status", 200);
 	add_topic("commander_state");
 	add_topic("cpuload");