MdeModulePkg: Define the VarCheckPolicyLib and SMM interface

https://bugzilla.tianocore.org/show_bug.cgi?id=2522

VariablePolicy is an updated interface to
replace VarLock and VarCheckProtocol.

This is an instance of a VarCheckLib that is backed by the
VariablePolicyLib business logic. It also publishes the SMM
calling interface for messages from the DXE protocol.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Bret Barkelew <brbarkel@microsoft.com>
Signed-off-by: Bret Barkelew <brbarkel@microsoft.com>
Reviewed-by: Dandan Bi <dandan.bi@intel.com>
Acked-by: Jian J Wang <jian.j.wang@intel.com>

MdeModulePkg/Library/VarCheckPolicyLib/VarCheckPolicyLib.inf

@@ -0,0 +1,42 @@
+## @file VarCheckPolicyLib.inf
+# This is an instance of a VarCheck lib that leverages the business logic behind
+# the VariablePolicy code to make its decisions.
+#
+# Copyright (c) Microsoft Corporation.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = VarCheckPolicyLib
+  FILE_GUID                      = 9C28A48F-C884-4B1F-8B95-DEF125448023
+  MODULE_TYPE                    = DXE_RUNTIME_DRIVER
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = NULL|DXE_RUNTIME_DRIVER DXE_SMM_DRIVER
+  CONSTRUCTOR                    = VarCheckPolicyLibConstructor
+
+
+[Sources]
+  VarCheckPolicyLib.c
+
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+
+
+[LibraryClasses]
+  BaseLib
+  DebugLib
+  BaseMemoryLib
+  DxeServicesLib
+  MemoryAllocationLib
+  VarCheckLib
+  VariablePolicyLib
+  VariablePolicyHelperLib
+  SafeIntLib
+  MmServicesTableLib
+
+
+[Guids]
+  gVarCheckPolicyLibMmiHandlerGuid        ## CONSUME ## Used to register for MM Communication events.