OvmfPkg/Library: Impl SmmCpuPlatformHookBeforeMmiHandler func

This patch is to add SmmCpuPlatformHookBeforeMmiHandler func
for OVMF.

Signed-off-by: Jiaxin Wu <[email protected]>

Author: jiaxinwu

OvmfPkg/Library/SmmCpuPlatformHookLibQemu/SmmCpuPlatformHookLibQemu.c

@@ -2,7 +2,7 @@
 SMM CPU Platform Hook library instance for QEMU.
 
 Copyright (c) 2020, Red Hat, Inc.
-Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2024, Intel Corporation. All rights reserved.<BR>
 SPDX-License-Identifier: BSD-2-Clause-Patent
 
 **/
@@ -113,3 +113,21 @@ GetPlatformPageTableAttribute (
 {
   return EFI_UNSUPPORTED;
 }
+
+/**
+  SMM CPU Platform Hook before executing MMI Handler.
+
+  This function can be used to perform the platform specific items before executing MMI Handler.
+
+  @retval EFI_SUCCESS      The smm cpu platform hook before executing MMI Handler is executed successfully.
+  @retval EFI_UNSUPPORTED  The smm cpu platform hook before executing MMI Handler is unsupported.
+
+**/
+EFI_STATUS
+EFIAPI
+SmmCpuPlatformHookBeforeMmiHandler (
+  VOID
+  )
+{
+  return EFI_UNSUPPORTED;
+}