MdeModulePkg: use LShiftU64() instead of "<<" to avoid IA32 build error.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>

MdeModulePkg/Core/Dxe/Misc/MemoryProtection.c

@@ -851,7 +851,7 @@ InitializeDxeNxMemoryProtectionPolicy (
     if (Attributes != 0) {
       SetUefiImageMemoryAttributes (
         MemoryMapEntry->PhysicalStart,
-        EFI_PAGES_TO_SIZE (MemoryMapEntry->NumberOfPages),
+        LShiftU64 (MemoryMapEntry->NumberOfPages, EFI_PAGE_SHIFT),
         Attributes);
     }
     MemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (MemoryMapEntry, DescriptorSize);