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/platforms/qurt/px4_layer/main.cpp

@@ -32,7 +32,7 @@
  ****************************************************************************/
 /**
  * @file main.cpp
- * Basic shell to execute builtin "apps" 
+ * Basic shell to execute builtin "apps"
  *
  * @author Mark Charlebois <charlebm@gmail.com>
  */
@@ -56,6 +56,8 @@ static px4_task_t g_dspal_task = -1;
 __BEGIN_DECLS
 // The commands to run are specified in a target file: commands_<target>.c
 extern const char *get_commands(void);
+// Enable external library hook
+void qurt_external_hook(void) __attribute__((weak));
 __END_DECLS
 
 static void run_cmd(map<string,px4_main_t> &apps, const vector<string> &appargs) {
@@ -108,7 +110,7 @@ static void process_commands(map<string,px4_main_t> &apps, const char *cmds)
 
 	// Eat leading whitespace
 	eat_whitespace(b, i);
-	
+
 
 	for(;;) {
 		// End of command line
@@ -156,15 +158,17 @@ __END_DECLS
 
 int dspal_entry( int argc, char* argv[] )
 {
-	//const char *argv[2] = { "dspal_client", NULL };
-	//int argc = 1;
-
 	PX4_INFO("In main\n");
 	map<string,px4_main_t> apps;
 	init_app_map(apps);
 	px4::init_once();
 	px4::init(argc, (char **)argv, "mainapp");
 	process_commands(apps, get_commands());
+	usleep( 1000000 ); // give time for all commands to execute before starting external function
+	if(qurt_external_hook)
+	{
+		qurt_external_hook();
+	}
 	for( ;; ){
 		usleep( 1000000 );
 	}