[redcode/crythread-2nd-pass] removed or replaced remaining CryMutex/CryLock usage with equivalent AZStd version

Signed-off-by: AMZN-ScottR <24445312+AMZN-ScottR@users.noreply.github.com>

Code/Legacy/CrySystem/SystemEventDispatcher.cpp

@@ -17,17 +17,17 @@ CSystemEventDispatcher::CSystemEventDispatcher()
 
 bool CSystemEventDispatcher::RegisterListener(ISystemEventListener* pListener)
 {
-    m_listenerRegistrationLock.Lock();
+    m_listenerRegistrationLock.lock();
     bool ret = m_listeners.Add(pListener);
-    m_listenerRegistrationLock.Unlock();
+    m_listenerRegistrationLock.unlock();
     return ret;
 }
 
 bool CSystemEventDispatcher::RemoveListener(ISystemEventListener* pListener)
 {
-    m_listenerRegistrationLock.Lock();
+    m_listenerRegistrationLock.lock();
     m_listeners.Remove(pListener);
-    m_listenerRegistrationLock.Unlock();
+    m_listenerRegistrationLock.unlock();
     return true;
 }
 
@@ -35,12 +35,12 @@ bool CSystemEventDispatcher::RemoveListener(ISystemEventListener* pListener)
 //////////////////////////////////////////////////////////////////////////
 void CSystemEventDispatcher::OnSystemEventAnyThread(ESystemEvent event, UINT_PTR wparam, UINT_PTR lparam)
 {
-    m_listenerRegistrationLock.Lock();
+    m_listenerRegistrationLock.lock();
     for (TSystemEventListeners::Notifier notifier(m_listeners); notifier.IsValid(); notifier.Next())
     {
         notifier->OnSystemEventAnyThread(event, wparam, lparam);
     }
-    m_listenerRegistrationLock.Unlock();
+    m_listenerRegistrationLock.unlock();
 }