Update ext-profiler example

Sync ext-profiler example with 2.26.2.


[ROCm/rccl commit: 145e67e707]

projects/rccl/ext-profiler/example/plugin.h

@@ -0,0 +1,13 @@
+/*************************************************************************
+ * Copyright (c) 2024, NVIDIA CORPORATION. All rights reserved.
+ *
+ * See LICENSE.txt for license information
+ ************************************************************************/
+
+#ifndef PLUGIN_H_
+#define PLUGIN_H_
+
+int exampleProfilerStart(int eActivationMask);
+int exampleProfilerStop(void);
+
+#endif