drm-fixes for 5.0-rc2, part 2

nouveau:
one backlight, falcon register access, and a fan fix.

i915:
- Disable PSR for Apple panels
- Broxton ERR_PTR error state fix
- Kabylake VECS workaround fix
- Unwind failure on pinning the gen7 ppgtt
- GVT workload request allocation fix

core:
- Fix fb-helper to work correctly with SDL 1.2 bugs.
- Fix lockdep warning in the atomic ioctl and setproperty.
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