cmake remove circular linking and reorganize

- px4_add_module now requires MAIN
 - px4_add_library doesn't automatically link

src/drivers/distance_sensor/ll40ls/CMakeLists.txt

@@ -40,6 +40,5 @@ px4_add_module(
 		LidarLiteI2C.cpp
 		LidarLitePWM.cpp
 	DEPENDS
-		platforms__common
 	)
-# vim: set noet ft=cmake fenc=utf-8 ff=unix :
+

src/drivers/distance_sensor/ll40ls/LidarLiteI2C.h

@@ -44,7 +44,7 @@
 
 #include <px4_workqueue.h>
 
-#include <systemlib/perf_counter.h>
+#include <perf/perf_counter.h>
 
 #include <drivers/device/i2c.h>
 #include <drivers/device/ringbuffer.h>

src/drivers/distance_sensor/ll40ls/LidarLitePWM.h

@@ -49,7 +49,7 @@
 
 
 #include <drivers/device/ringbuffer.h>
-#include <systemlib/perf_counter.h>
+#include <perf/perf_counter.h>
 
 #include <uORB/uORB.h>
 #include <uORB/topics/pwm_input.h>