UefiCpuPkg: Add CPU Features PEI/DXE drivers

They will consume Register CPU Features library to detect and initialize CPU
features.

CpuFeaturesPei driver is used to initialize CPU features in PEI phase.
CpuFeaturesDxe driver is used to initialize CPU features in DXE phase.

Add PcdCpuFeaturesInitAfterSmmRelocation and PcdCpuFeaturesInitOnS3Resume
that consumed by CpuFeaturesPei and CpuFeaturesDxe.

Cc: Feng Tian <feng.tian@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>

UefiCpuPkg/CpuFeatures/CpuFeaturesDxe.inf

@@ -0,0 +1,53 @@
+## @file
+#  CPU Features DXE driver.
+#
+#  Copyright (c) 2017, 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                      = CpuFeaturesDxe
+  MODULE_UNI_FILE                = CpuFeaturesDxe.uni
+  FILE_GUID                      = 63EB1B62-10C9-4693-88AC-AE0999EA87F8
+  MODULE_TYPE                    = DXE_DRIVER
+  VERSION_STRING                 = 1.0
+
+  ENTRY_POINT                    = CpuFeaturesDxeInitialize
+
+[Packages]
+  MdePkg/MdePkg.dec
+  UefiCpuPkg/UefiCpuPkg.dec
+
+[LibraryClasses]
+  BaseLib
+  DebugLib
+  UefiLib
+  UefiDriverEntryPoint
+  UefiBootServicesTableLib
+  RegisterCpuFeaturesLib
+
+[Sources]
+  CpuFeaturesDxe.c
+
+[Guids]
+  gEdkiiCpuFeaturesInitDoneGuid                                   ## PRODUCES
+
+[Protocols]
+  gEfiSmmConfigurationProtocolGuid                                ## SOMETIME_CONSUMES
+
+[Pcd]
+  gUefiCpuPkgTokenSpaceGuid.PcdCpuFeaturesInitAfterSmmRelocation  ## CONSUMES
+
+[Depex]
+  TRUE
+
+[UserExtensions.TianoCore."ExtraFiles"]
+  CpuFeaturesDxeExtra.uni