[mw320] Remove shell dependency on app/server

Use PlatformMgr directly.

Signed-off-by: Adrian Gielniewski <adrian.gielniewski@gmail.com>

Author: adigie

src/lib/shell/MainLoopMW320.cpp

@@ -16,7 +16,6 @@
  */
 
 #include "streamer.h"
-#include <app/server/Server.h>
 #include <lib/shell/Engine.h>
 #include <platform/CHIPDeviceLayer.h>
 #include <platform/CommissionableDataProvider.h>
@@ -161,7 +160,7 @@ static void AtExitShell(void);
 static CHIP_ERROR ShutdownHandler(int argc, char ** argv)
 {
     streamer_printf(streamer_get(), "Shutdown and Goodbye\r\n");
-    Server::GetInstance().GenerateShutDownEvent();
+    DeviceLayer::PlatformMgr().ScheduleWork([](intptr_t) { DeviceLayer::PlatformMgr().HandleServerShuttingDown(); });
     // TODO: This is assuming that we did (on a different thread from this one)
     // RunEventLoop(), not StartEventLoopTask().  It will not work correctly
     // with StartEventLoopTask().