cmake remove circular linking and reorganize

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

src/drivers/px4flow/CMakeLists.txt

@@ -38,6 +38,5 @@ px4_add_module(
 	SRCS
 		px4flow.cpp
 	DEPENDS
-		platforms__common
 	)
-# vim: set noet ft=cmake fenc=utf-8 ff=unix :
+

src/drivers/px4flow/px4flow.cpp

@@ -62,9 +62,9 @@
 #include <nuttx/wqueue.h>
 #include <nuttx/clock.h>
 
-#include <systemlib/perf_counter.h>
+#include <perf/perf_counter.h>
 #include <systemlib/err.h>
-#include <systemlib/param/param.h>
+#include <parameters/param.h>
 
 #include <conversion/rotation.h>