libnvdimm for 4.13

* Introduce the _flushcache() family of memory copy helpers and use them
  for persistent memory write operations on x86. The _flushcache()
  semantic indicates that the cache is either bypassed for the copy
  operation (movnt) or any lines dirtied by the copy operation are
  written back (clwb, clflushopt, or clflush).

* Extend dax_operations with ->copy_from_iter() and ->flush()
  operations. These operations and other infrastructure updates allow
  all persistent memory specific dax functionality to be pushed into
  libnvdimm and the pmem driver directly. It also allows dax-specific
  sysfs attributes to be linked to a host device, for example:
      /sys/block/pmem0/dax/write_cache

* Add support for the new NVDIMM platform/firmware mechanisms introduced
  in ACPI 6.2 and UEFI 2.7. This support includes the v1.2 namespace
  label format, extensions to the address-range-scrub command set, new
  error injection commands, and a new BTT (block-translation-table)
  layout. These updates support inter-OS and pre-OS compatibility.

* Fix a longstanding memory corruption bug in nfit_test.

* Make the pmem and nvdimm-region 'badblocks' sysfs files poll(2)
  capable.

* Miscellaneous fixes and small updates across libnvdimm and the nfit
  driver.

Acknowledgements that came after the branch was pushed:

commit 6aa734a2f38e "libnvdimm, region, pmem: fix 'badblocks'
  sysfs_get_dirent() reference lifetime"
Reviewed-by: Toshi Kani <toshi.kani@hpe.com>
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