am: activate event observer

src/core/hle/service/am/am.cpp

@@ -3,6 +3,7 @@
 
 #include "core/hle/service/am/am.h"
 #include "core/hle/service/am/button_poller.h"
+#include "core/hle/service/am/event_observer.h"
 #include "core/hle/service/am/service/all_system_applet_proxies_service.h"
 #include "core/hle/service/am/service/application_proxy_service.h"
 #include "core/hle/service/server_manager.h"
@@ -11,6 +12,7 @@ namespace Service::AM {
 
 void LoopProcess(Core::System& system) {
     ButtonPoller button_poller(system);
+    EventObserver event_observer(system);
 
     auto server_manager = std::make_unique<ServerManager>(system);