MdeModulePkg DxeCore: Enhance MemoryAttributesTable installation

Current MemoryAttributesTable will be installed on ReadyToBoot event
at TPL_NOTIFY level, it maybe incorrect when PcdHiiOsRuntimeSupport
= TRUE as HiiDatabaseDxe will have runtime memory allocation for HII
OS runtime support on and after ReadyToBoot. The issue was exposed at
http://article.gmane.org/gmane.comp.bios.edk2.devel/10125.

To make sure the correctness of MemoryAttributesTable, this patch is
to enhance MemoryAttributesTable installation to install
MemoryAttributesTable on ReadyToBoot event at TPL_CALLBACK - 1 level
to make sure it is at the last of ReadyToBoot event, and also hook
runtime memory allocation after ReadyToBoot.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

MdeModulePkg/Core/Dxe/Mem/Pool.c

@@ -277,6 +277,7 @@ CoreAllocatePool (
   Status = CoreInternalAllocatePool (PoolType, Size, Buffer);
   if (!EFI_ERROR (Status)) {
     CoreUpdateProfile ((EFI_PHYSICAL_ADDRESS) (UINTN) RETURN_ADDRESS (0), MemoryProfileActionAllocatePool, PoolType, Size, *Buffer);
+    InstallMemoryAttributesTableOnMemoryAllocation (PoolType);
   }
   return Status;
 }
@@ -505,6 +506,7 @@ CoreFreePool (
   Status = CoreInternalFreePool (Buffer, &PoolType);
   if (!EFI_ERROR (Status)) {
     CoreUpdateProfile ((EFI_PHYSICAL_ADDRESS) (UINTN) RETURN_ADDRESS (0), MemoryProfileActionFreePool, (EFI_MEMORY_TYPE) 0, 0, Buffer);
+    InstallMemoryAttributesTableOnMemoryAllocation (PoolType);
   }
   return Status;
 }