MdePkg: Add CcProbeLibNull

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3902

CcProbeLib is used to probe the Confidential Computing guest type.
This library is designed to run on SEC / PEI / DXE phases. A null
instance of the library always returns CCGuestTypeNonEncrypted.
A platform specific CcProbeLib will be implemented, for example,
in OvmfPkg.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>

MdePkg/Library/CcProbeLibNull/CcProbeLibNull.inf

@@ -0,0 +1,21 @@
+## @file
+# CcProbeLib null instance.
+#
+#  Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = CcProbeLibNull
+  FILE_GUID                      = B15D67FE-0DAC-4316-8E26-8A6b85E43782
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = CcProbeLib
+
+[Sources]
+  CcProbeLibNull.c
+
+[Packages]
+  MdePkg/MdePkg.dec