1. Add new API MigratePeiServicesTablePointer() in PeiServicesTablePointerLib class.
2. PeiCore will call this API to migrate the PEI Services Table pointer from temporary RAM to permanent RAM.

Signed-off-by: Gao, Liming <liming.gao@intel.com>
Reviewed-by: Kinney, Michael D <michael.d.kinney@intel.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/MdeModulePkg@15115 6f19259b-4bc3-4df7-8a09-765794883524