IntelSiliconPkg: Move MicrocodeUpdate from UefiCpuPkg

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=540

To consume FIT table for Microcode update,
UefiCpuPkg/Feature/Capsule/MicrocodeUpdateDxe
needs to be updated to consume
IntelSiliconPkg/Include/IndustryStandard/FirmwareInterfaceTable.h,
but UefiCpuPkg could not depend on IntelSiliconPkg.

Since the Microcode update feature is specific to Intel,
we can first move the Microcode update feature code from
UefiCpuPkg to IntelSiliconPkg [first step], then update
the code to consume FIT table [second step].

This patch series is for the first step.

Note: No any code change in this patch, just move.
Next patch will update MicrocodeUpdate to build with the package.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Regression-tested-by: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>

IntelSiliconPkg/Feature/Capsule/Library/MicrocodeFlashAccessLibNull/MicrocodeFlashAccessLibNull.inf

@@ -0,0 +1,40 @@
+## @file
+#  Microcode flash device access library.
+#
+#  Microcode flash device access library NULL instance.
+#
+#  Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+#  This program and the accompanying materials
+#  are licensed and made available under the terms and conditions of the BSD License
+#  which accompanies this distribution.  The full text of the license may be found at
+#  http://opensource.org/licenses/bsd-license.php
+#
+#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = MicrocodeFlashAccessLibNull
+  MODULE_UNI_FILE                = MicrocodeFlashAccessLibNull.uni
+  FILE_GUID                      = 6F871ADD-9D86-4676-8BAD-68E2E451FC5B
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = MicrocodeFlashAccessLib
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64 IPF EBC
+#
+
+[Sources]
+  MicrocodeFlashAccessLibNull.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  UefiCpuPkg/UefiCpuPkg.dec
+
+[LibraryClasses]
+  BaseMemoryLib