Mark XtMapHardwareMemoryPool() routine private

xtldr/modules/xtos_o/includes/xtos.h

@@ -96,6 +96,10 @@ XtpLoadModule(IN PEFI_FILE_HANDLE BootDir,
               IN LOADER_MEMORY_TYPE MemoryType,
               OUT PPECOFF_IMAGE_CONTEXT *ImageContext);
 
+XTCDECL
+EFI_STATUS
+XtpMapHardwareMemoryPool(IN PXTBL_PAGE_MAPPING PageMap);
+
 XTCDECL
 EFI_STATUS
 BlXtLdrModuleMain(IN EFI_HANDLE ImageHandle,