drm fixes for 5.12-rc3

core:
- Clear holes when converting compat ioctl's between 32-bits and 64-bits.

docs:
- Use gitlab for drm bugzilla now.

ttm:
- Fix ttm page pool accounting.

fbdev:
- Fix oops in drm_fbdev_cleanup()

shmem:
- Assorted fixes for shmem helpers.

qxl:
- unpin qxl bos created as pinned when freeing them,
  and make ttm only warn once on this behavior.
- Zero head.surface_id correctly in qxl.

atyfb:
- Use LCD management for atyfb on PPC_MAC.

meson:
- Shutdown kms poll helper in meson correctly.

nouveau:
- fix regression in bo syncing

i915:
- Wedge the GPU if command parser setup fails

amdgpu:
- Fix aux backlight control
- Add a backlight override parameter
- Various display fixes
- PCIe DPM fix for vega
- Polaris watermark fixes
- Additional S0ix fix

radeon:
- Fix GEM regression
- Fix AGP dependency handling
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