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>

UefiCpuPkg/UefiCpuPkg.dec

@@ -59,17 +59,10 @@
   ##
   MpInitLib|Include/Library/MpInitLib.h
 
-  ## @libraryclass  Provides services to access Microcode region on flash device.
-  #
-  MicrocodeFlashAccessLib|Include/Library/MicrocodeFlashAccessLib.h
-
 [Guids]
   gUefiCpuPkgTokenSpaceGuid      = { 0xac05bf33, 0x995a, 0x4ed4, { 0xaa, 0xb8, 0xef, 0x7a, 0xe8, 0xf, 0x5c, 0xb0 }}
   gMsegSmramGuid                 = { 0x5802bce4, 0xeeee, 0x4e33, { 0xa1, 0x30, 0xeb, 0xad, 0x27, 0xf0, 0xe4, 0x39 }}
 
-  ## Include/Guid/MicrocodeFmp.h
-  gMicrocodeFmpImageTypeIdGuid      = { 0x96d4fdcd, 0x1502, 0x424d, { 0x9d, 0x4c, 0x9b, 0x12, 0xd2, 0xdc, 0xae, 0x5c } }
-
   ## Include/Guid/CpuFeaturesSetDone.h
   gEdkiiCpuFeaturesSetDoneGuid   = { 0xa82485ce, 0xad6b, 0x4101, { 0x99, 0xd3, 0xe1, 0x35, 0x8c, 0x9e, 0x7e, 0x37 }}