mm: generalize the pgmap based page_free infrastructure

Key off on the existence of ->page_free to prepare for adding support for
more pgmap types that are device managed and thus need the free callback.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Christoph Hellwig <[email protected]>
Tested-by: "Sierra Guiza, Alejandro (Alex)" <[email protected]>

Cc: Alex Deucher <[email protected]>
Cc: Alistair Popple <[email protected]>
Cc: Ben Skeggs <[email protected]>
Cc: Chaitanya Kulkarni <[email protected]>
Cc: Christian Knig <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Felix Kuehling <[email protected]>
Cc: Jason Gunthorpe <[email protected]>
Cc: Karol Herbst <[email protected]>
Cc: Logan Gunthorpe <[email protected]>
Cc: Lyude Paul <[email protected]>
Cc: Miaohe Lin <[email protected]>
Cc: Muchun Song <[email protected]>
Cc: "Pan, Xinhui" <[email protected]>
Cc: Ralph Campbell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>

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