special i915-gem-next pull as requested

- Conversion to dma_resv_locking, obj->mm.lock is gone (Maarten, with
  help from Thomas Hellström)
- watchdog (Tvrtko, one patch to cancel individual request from Chris)
- legacy ioctl cleanup (Jason+Ashutosh)
- i915-gem TODO and RFC process doc (me)
- i915_ prefix for vma_lookup (Liam Howlett) just because I spotted it
  and put it in here too
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