UefiCpuPkg/CpuMpPei: Enable paging and set NP flag to avoid TOCTOU (CVE-2019-11098)

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=1614

To avoid the TOCTOU, enable paging and set Not Present flag so when
access any code in the flash range, it will trigger #PF exception.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Signed-off-by: Guomin Jiang <guomin.jiang@intel.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

UefiCpuPkg/CpuMpPei/CpuMpPei.inf

@@ -46,6 +46,9 @@
   BaseMemoryLib
   CpuLib
 
+[Guids]
+  gEdkiiMigratedFvInfoGuid                                             ## SOMETIMES_CONSUMES     ## HOB
+
 [Ppis]
   gEfiPeiMpServicesPpiGuid                      ## PRODUCES
   gEfiSecPlatformInformationPpiGuid             ## SOMETIMES_CONSUMES