Build fixes for qurt after rebase on PX4 master

Removed the re-definitions of the usage method in the posix/main.cpp file.
Added qurt_external_hook interface to call externally linked module.
Fixed code format to comply with PX4 style.
Added usage information to main app and handled cases for unknown arguments.
Fixed the orb_priority interface to use int32_t instead of int.
Fixes to get hil working with led changes.
Added the config_eagle_adsp.mk file and update the make files to to use new
include/lib paths

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

src/modules/uORB/uORB.cpp

@@ -284,7 +284,7 @@ int  orb_group_count(const struct orb_metadata *meta)
  *      priority, independent of the startup order of the associated publishers.
  * @return    OK on success, ERROR otherwise with errno set accordingly.
  */
-int  orb_priority(int handle, int *priority)
+int  orb_priority(int handle, int32_t *priority)
 {
 	return uORB::Manager::get_instance()->orb_priority(handle, priority);
 }