UefiCpuPkg/CpuMpPei: Delete PeiMpServices.c and PeiMpServices.h

UefiCpuPkg/CpuMpPei: Delete PeiMpServices.c and PeiMpServices.h

Move the code in PeiMpServices.c & PeiMpServices.h to CpuMpPei.c & CpuMpPei.h.

v3:
  1. Rename MpInitLibSwitchBSP to MpInitLibSwitchBSP
  2. Add PeiMpInitLib.inf in DSC file

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>