First page is now always present in memory map, so there is no need to map it explicitly

xtldr/arch/amd64/memory.c

@@ -119,9 +119,6 @@ BlBuildPageMap(IN PXTBL_PAGE_MAPPING PageMap)
         ListEntry = ListEntry->Flink;
     }
 
-    /* Finally, map zero page */
-    BlMapPage(PageMap, 0, 0, 1);
-
     /* Return success */
     return STATUS_EFI_SUCCESS;
 }