refactor(simu): use C++ native threads (#6449)

Co-authored-by: raphaelcoeffic <1050031+raphaelcoeffic@users.noreply.github.com>
Co-authored-by: Malte Langermann <malte@langermann.net>

radio/src/os/async_native.cpp

@@ -20,7 +20,7 @@
  */
 
 #include "async.h"
-#include "timer_pthread_impl.h"
+#include "timer_native_impl.h"
 
 bool async_call(async_func_t func, volatile bool* excl_flag, void* param1,
                 uint32_t param2)