LoongArch: add sparse memory vmemmap support

Add sparse memory vmemmap support for LoongArch.  SPARSEMEM_VMEMMAP uses a
virtually mapped memmap to optimise pfn_to_page and page_to_pfn
operations.  This is the most efficient option when sufficient kernel
resources are available.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Min Zhou <[email protected]>
Signed-off-by: Feiyang Chen <[email protected]>
Signed-off-by: Huacai Chen <[email protected]>
Reviewed-by: Arnd Bergmann <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Dinh Nguyen <[email protected]>
Cc: Guo Ren <[email protected]>
Cc: Jiaxun Yang <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Philippe Mathieu-Daudé <[email protected]>
Cc: Thomas Bogendoerfer <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Xuefeng Li <[email protected]>
Cc: Xuerui Wang <[email protected]>
Cc: Muchun Song <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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