hmm_range_fault related fixes and legacy API removal v2

Christoph Hellwig
2019-07-03T22:02:44Z

Hi Jérôme, Ben and Jason,

below is a series against the hmm tree which fixes up the mmap_sem
locking in nouveau and while at it also removes leftover legacy HMM APIs
only used by nouveau.

Changes since v1:
- don't return the valid state from hmm_range_unregister
- additional nouveau cleanups