UefiCpuPkg/PiSmmCpu: Add NULL func for 2 new APIs in SmmCpuFeaturesLib.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: "Yao, Jiewen" <jiewen.yao@intel.com>
Reviewed-by: "Kinney, Michael D" <michael.d.kinney@intel.com>
Cc: "Fan, Jeff" <jeff.fan@intel.com>
Cc: "Kinney, Michael D" <michael.d.kinney@intel.com>
Cc: "Laszlo Ersek" <lersek@redhat.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18980 6f19259b-4bc3-4df7-8a09-765794883524

UefiCpuPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.c

@@ -615,3 +615,44 @@ SmmCpuFeaturesWriteSaveStateRegister (
 {
   return EFI_UNSUPPORTED;
 }
+
+/**
+  This function is hook point called after the gEfiSmmReadyToLockProtocolGuid
+  notification is completely processed.
+**/
+VOID
+EFIAPI
+SmmCpuFeaturesCompleteSmmReadyToLock (
+  VOID
+  )
+{
+}
+
+/**
+  This API provides a method for a CPU to allocate a specific region for storing page tables.
+
+  This API can be called more once to allocate memory for page tables.
+
+  Allocates the number of 4KB pages of type EfiRuntimeServicesData and returns a pointer to the
+  allocated buffer.  The buffer returned is aligned on a 4KB boundary.  If Pages is 0, then NULL
+  is returned.  If there is not enough memory remaining to satisfy the request, then NULL is
+  returned.
+
+  This function can also return NULL if there is no preference on where the page tables are allocated in SMRAM.
+
+  @param  Pages                 The number of 4 KB pages to allocate.
+
+  @return A pointer to the allocated buffer for page tables.
+  @retval NULL      Fail to allocate a specific region for storing page tables,
+                    Or there is no preference on where the page tables are allocated in SMRAM.
+
+**/
+VOID *
+EFIAPI
+SmmCpuFeaturesAllocatePageTableMemory (
+  IN UINTN           Pages
+  )
+{
+  return NULL;
+}
+