[PATCH] Revert "drm/amdgpu: init iommu after amdkfd device init"

[Matthew Ruffell]

Hi Greg KH, Sasha,

Please pick up this patch for 5.15 stable tree. I have built a test kernel and
can confirm that it fixes affected users.

Downstream bug:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2068738

Thanks,
Matthew