UefiCpuPkg/MpInitLib: Implementation of MpInitLibEnableDisableAP()

v4:
  1. Simply the internal function MpInitLibEnableDisableAP()'s function
     header due to it is duplicated with MpInitLibEnableDisableAP().
v3:
  1. Use CamelCase for mCheckAllAPsEvent, mStopCheckAllApsStatus.

Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Giri P Mudusuru <giri.p.mudusuru@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Michael Kinney <michael.d.kinney@intel.com>

UefiCpuPkg/Library/MpInitLib/DxeMpLib.c

@@ -454,5 +454,23 @@ MpInitLibEnableDisableAP (
   IN  UINT32                    *HealthFlag OPTIONAL
   )
 {
-  return EFI_UNSUPPORTED;
+  EFI_STATUS     Status;
+  BOOLEAN        TempStopCheckState;
+
+  TempStopCheckState = FALSE;
+  //
+  // temporarily stop checkAllAPsStatus for initialize parameters.
+  //
+  if (!mStopCheckAllApsStatus) {
+    mStopCheckAllApsStatus = TRUE;
+    TempStopCheckState     = TRUE;
+  }
+
+  Status = EnableDisableApWorker (ProcessorNumber, EnableAP, HealthFlag);
+
+  if (TempStopCheckState) {
+    mStopCheckAllApsStatus = FALSE;
+  }
+
+  return Status;
 }