drm fixes for 6.16-rc8

gem:
- revert all the dma-buf/gem changes
  as there as lifetime issues with it.

nouveau:
- revert an ioctl change as it causes issues
- fix NULL ptr on fermi

bridge:
- remove extra semicolon

sched:
- remove hang causing optimisation

amdgpu:
- fix garbage in cleared vram after resume
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