Use px4_config.h instead of nuttx/config.h

Modified code to use OS independent header file for config settings.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

src/drivers/ardrone_interface/ardrone_interface.c

@@ -37,7 +37,7 @@
  * Implementation of AR.Drone 1.0 / 2.0 motor control interface.
  */
 
-#include <nuttx/config.h>
+#include <px4_config.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

src/drivers/ardrone_interface/ardrone_motor_control.c

@@ -37,7 +37,7 @@
  * Implementation of AR.Drone 1.0 / 2.0 motor control interface
  */
 
-#include <nuttx/config.h>
+#include <px4_config.h>
 #include <stdio.h>
 #include <fcntl.h>
 #include <unistd.h>