drm fixes for 5.7-rc1

core:
- revert drm_mm atomic patch
- dt binding fixes

fbcon:
- null ptr error fix

i915:
- GVT fixes

nouveau:
- runpm fix
- svm fixes

amdgpu:
- HDCP fixes
- gfx10 fix
- Misc display fixes
- BACO fixes

amdkfd:
- Fix memory leak

vboxvideo:
- remove conflicting fbs

vc4:
- mode validation fix

xen:
- fix PTR_ERR usage
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