Sync drivers/gpu/drm from v5.14

[Impact]
We need to support new hardware from AMD and Intel, but backporting support to oem-5.13 is very laborous and prone to errors.

[Fix]
The only sane way to add a better base for the new hw is by syncing the whole drivers/gpu/drm directory from current 5.14. We also need to update drivers/dma-buf and include a minor abi revert for NVIDIA.

[Test case]
Boot current and new hw from AMD & Intel with the new kernel, and also test that NVIDIA dkms still builds.

[Where things could go wrong]
Any drm driver could regress, but since v5.14 is already at rc6 this is less likely, and for oem-5.13 we mostly care about drm/amdgpu and drm/i915 anyway.