UefiCpuPkg/MpInitLib: Move two functions location

Just move BackupAndPrepareWakeupBuffer() and RestoreWakeupBuffer() from
PeiMpLib.c to MpLib.c.

Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Feng Tian <feng.tian@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/Library/MpInitLib/MpLib.h

@@ -550,5 +550,25 @@ CpuMpEndOfPeiCallback (
   IN VOID                         *Ppi
   );
 
+/**
+  Get available system memory below 1MB by specified size.
+
+  @param[in]  CpuMpData  The pointer to CPU MP Data structure.
+**/
+VOID
+BackupAndPrepareWakeupBuffer(
+  IN CPU_MP_DATA              *CpuMpData
+  );
+
+/**
+  Restore wakeup buffer data.
+
+  @param[in]  CpuMpData  The pointer to CPU MP Data structure.
+**/
+VOID
+RestoreWakeupBuffer(
+  IN CPU_MP_DATA              *CpuMpData
+  );
+
 #endif