Add IPC Events support

Change-Id: Iac2bf3d5e1d9a993bebbb066c20d300d6f05558b

hipamd/include/hip/amd_detail/hip_runtime_api.h

@@ -98,9 +98,9 @@ typedef struct hipIpcMemHandle_st {
     char reserved[HIP_IPC_HANDLE_SIZE];
 } hipIpcMemHandle_t;
 
-// TODO: IPC event handle currently unsupported
-struct ihipIpcEventHandle_t;
-typedef struct ihipIpcEventHandle_t* hipIpcEventHandle_t;
+typedef struct hipIpcEventHandle_st {
+    char reserved[HIP_IPC_HANDLE_SIZE];
+} hipIpcEventHandle_t;
 
 typedef struct ihipModule_t* hipModule_t;