MdeModulePkg and Nt32Pkg Pcd: Add the new EFI_GET_PCD_INFO_PROTOCOL and EFI_GET_PCD_INFO_PPI support for PI 1.2.1 compliance.

It has no obviously benefit to reduce size by PcdPcdInfoGeneration, so remove this PCD.
And PCD_INFO_GENERATION flag can be used to enable/disable PCD info feature, a sample is added in Nt32Pkg to show how to use this flag.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14869 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/PCD/Pei/Pcd.c

@@ -158,9 +158,9 @@ PcdPeimInit (
   ASSERT_EFI_ERROR (Status);
 
   //
-  // Only install PcdInfo PPI when the feature is enabled and PCD info content is present. 
+  // Only install PcdInfo PPI when PCD info content is present. 
   //
-  if (FeaturePcdGet (PcdPcdInfoGeneration) && (DataBase->PcdNameTableOffset != 0)) {
+  if (DataBase->PcdNameTableOffset != 0) {
     //
     // Install GET_PCD_INFO_PPI and EFI_GET_PCD_INFO_PPI.
     //
@@ -232,9 +232,6 @@ PeiGetPcdInfoGetSku (
   VOID
   )
 {
-  if (!FeaturePcdGet (PcdPcdInfoGeneration)) {
-    return EFI_UNSUPPORTED;
-  }
   return GetPcdDatabase()->SystemSkuId;
 }
 

MdeModulePkg/Universal/PCD/Pei/Pcd.inf

@@ -343,7 +343,6 @@
 [Pcd]
   gEfiMdeModulePkgTokenSpaceGuid.PcdVpdBaseAddress ## SOMETIMES_CONSUMES
   gEfiMdeModulePkgTokenSpaceGuid.PcdMaxPeiPcdCallBackNumberPerPcdEntry || gEfiMdeModulePkgTokenSpaceGuid.PcdPeiFullPcdDatabaseEnable ## SOMETIMES_CONSUMES
-  gEfiMdeModulePkgTokenSpaceGuid.PcdPcdInfoGeneration
 
 [Depex]
   TRUE

MdeModulePkg/Universal/PCD/Pei/Service.c

@@ -247,10 +247,6 @@ PeiGetPcdInfo (
   UINTN                 PeiNexTokenNumber;
   UINT32                LocalTokenNumber;
 
-  if (!FeaturePcdGet (PcdPcdInfoGeneration)) {
-    return EFI_UNSUPPORTED;
-  }
-
   ASSERT (PcdInfo != NULL);
 
   PeiPcdDb          = GetPcdDatabase ();