drm fixes for 5.6.0-rc4

amdgpu:
- Drop DRIVER_USE_AGP
- Fix memory leak in GPU reset
- Resume fix for raven

radeon:
- Drop DRIVER_USE_AGP

i915:
- downgrade gen7 back to aliasing-ppgtt to avoid GPU hangs
- shrinker fix
- pmu leak and double free fixes
- gvt user after free and virtual display reset fixes
- randconfig build fix
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