os: implement ReadWriteLock

libraries/libstratosphere/source/os/os_tick.cpp

@@ -22,6 +22,10 @@ namespace ams::os {
         return impl::GetTickManager().GetTick();
     }
 
+    Tick GetSystemTickOrdered() {
+        return impl::GetTickManager().GetSystemTickOrdered();
+    }
+
     s64 GetSystemTickFrequency() {
         return impl::GetTickManager().GetTickFrequency();
     }