Create null instance for TdxLib. The IoLib instance
BaseIoLibIntrinsic.inf will consume the TdxLibNull
to pass build.

Signed-off-by: Dun Tan <dun.tan@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
---
 MdePkg/Library/TdxLib/TdxLibNull.inf | 21 +++++++++++++++++++++
 MdePkg/MdePkg.dsc                    |  1 +
 2 files changed, 22 insertions(+)

diff --git a/MdePkg/Library/TdxLib/TdxLibNull.inf b/MdePkg/Library/TdxLib/TdxLibNull.inf
new file mode 100644
index 0000000000..ecf20e12e1
--- /dev/null
+++ b/MdePkg/Library/TdxLib/TdxLibNull.inf
@@ -0,0 +1,21 @@
+## @file
+# Tdx null instance.
+#
+#  Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = TdxLibNull
+  FILE_GUID                      = AA75759C-24E0-42FE-B5A4-83678548FCEF
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = TdxLib
+
+[Sources]
+  TdxLibNull.c
+
+[Packages]
+  MdePkg/MdePkg.dec
diff --git a/MdePkg/MdePkg.dsc b/MdePkg/MdePkg.dsc
index 3abd1a1e23..a1be123d80 100644
--- a/MdePkg/MdePkg.dsc
+++ b/MdePkg/MdePkg.dsc
@@ -184,6 +184,7 @@
   MdePkg/Library/MmServicesTableLib/MmServicesTableLib.inf
   MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.inf
   MdePkg/Library/TdxLib/TdxLib.inf
+  MdePkg/Library/TdxLib/TdxLibNull.inf
   MdePkg/Library/MipiSysTLib/MipiSysTLib.inf
   MdePkg/Library/TraceHubDebugSysTLibNull/TraceHubDebugSysTLibNull.inf
 
--
2.31.1.windows.1