Kernel: Change WaitObject to Synchronization object. In order to better reflect RE.

src/core/hle/kernel/session.h

@@ -8,7 +8,7 @@
 #include <string>
 #include <utility>
 
-#include "core/hle/kernel/wait_object.h"
+#include "core/hle/kernel/synchronization_object.h"
 
 namespace Kernel {
 
@@ -19,7 +19,7 @@ class ServerSession;
  * Parent structure to link the client and server endpoints of a session with their associated
  * client port.
  */
-class Session final : public WaitObject {
+class Session final : public SynchronizationObject {
 public:
     explicit Session(KernelCore& kernel);
     ~Session() override;