mm: huge_memory: enable debugfs to split huge pages to any order

It is used to test split_huge_page_to_list_to_order for pagecache THPs. 
Also add test cases for split_huge_page_to_list_to_order via both debugfs.

[[email protected]: fix issue discovered with NFS]
  Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Zi Yan <[email protected]>
Tested-by: Aishwarya TCV <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Luis Chamberlain <[email protected]>
Cc: "Matthew Wilcox (Oracle)" <[email protected]>
Cc: Michal Koutny <[email protected]>
Cc: Roman Gushchin <[email protected]>
Cc: Ryan Roberts <[email protected]>
Cc: Yang Shi <[email protected]>
Cc: Yu Zhao <[email protected]>
Cc: Zach O'Keefe <[email protected]>
Cc: Aishwarya TCV <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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