mm, devm_memremap_pages: add MEMORY_DEVICE_PRIVATE support

mm, devm_memremap_pages: add MEMORY_DEVICE_PRIVATE support

In preparation for consolidating all ZONE_DEVICE enabling via
devm_memremap_pages(), teach it how to handle the constraints of
MEMORY_DEVICE_PRIVATE ranges.

[[email protected]: call move_pfn_range_to_zone for MEMORY_DEVICE_PRIVATE]
Link: http://lkml.kernel.org/r/154275559036.76910.12434636179931292607.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <[email protected]>
Reviewed-by: Jérôme Glisse <[email protected]>
Acked-by: Christoph Hellwig <[email protected]>
Reported-by: Logan Gunthorpe <[email protected]>
Reviewed-by: Logan Gunthorpe <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>