cmake remove circular linking and reorganize

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

src/systemcmds/mtd/24xxxx_mtd.c

@@ -66,7 +66,7 @@
 #include <nuttx/i2c/i2c_master.h>
 #include <nuttx/mtd/mtd.h>
 
-#include "systemlib/perf_counter.h"
+#include <perf/perf_counter.h>
 
 /************************************************************************************
  * Pre-processor Definitions

src/systemcmds/mtd/CMakeLists.txt

@@ -38,6 +38,5 @@ px4_add_module(
 		mtd.c
 		24xxxx_mtd.c
 	DEPENDS
-		platforms__common
 	)
-# vim: set noet ft=cmake fenc=utf-8 ff=unix :
+

src/systemcmds/mtd/mtd.c

@@ -63,7 +63,7 @@
 
 #include "systemlib/px4_macros.h"
 #include "systemlib/systemlib.h"
-#include "systemlib/param/param.h"
+#include <parameters/param.h>
 
 #include <board_config.h>