Kernel: Made SyncRequest not pure virtual, with a default implementation of error (as this is not required for all kernel objects)

src/core/hle/kernel/thread.cpp

@@ -37,16 +37,6 @@ public:
     inline bool IsWaiting() const { return (status & THREADSTATUS_WAIT) != 0; }
     inline bool IsSuspended() const { return (status & THREADSTATUS_SUSPEND) != 0; }
 
-    /**
-     * Synchronize kernel object 
-     * @param wait Boolean wait set if current thread should wait as a result of sync operation
-     * @return Result of operation, 0 on success, otherwise error code
-     */
-    Result SyncRequest(bool* wait) {
-        // TODO(bunnei): ImplementMe
-        return 0;
-    }
-
     /**
      * Wait for kernel object to synchronize
      * @param wait Boolean wait set if current thread should wait as a result of sync operation