Adding logger module to advligorts

Not adding code to use it yet.

src/drv/rts-logger/module/rts-logger.c

@@ -160,7 +160,7 @@ int printer_thread_fn( void * pv )
         {
 
             //If num filled is ready but ready_for_print is not, we are waiting for 
-            //the vsnprintf to complete
+            //the vsnprintf to complete, which will be fast
             if(ready_for_print[next_to_print] == 0)
             {
                 schedule();
@@ -181,9 +181,12 @@ int printer_thread_fn( void * pv )
         }
         num_read = 0;
 
-        //If there are no mesages ready for printing, we can give up the CPU
+        // If there are no mesages ready for printing, we can give up the CPU
+        // for a while
         if( atomic_read(&g_num_filled) == 0)
-            usleep_range(499, 1000);
+            usleep_range(1000, 2500);
+        else //We have more messages
+            schedule();
     }
     return 0;
 }