Changes to let KFD use render node VMs

[Felix Kuehling]

Hi Christian,

I have a working patch series against amd-kfg-staging that lets KFD use
VMs from render node FDs, as we discussed. There are two patches in that
series that touch amdgpu_vm.[ch] that I'd like your feedback on before I
commit the changes to amd-kfd-staging and include them in my upstream
patch series for KFD GPUVM support. See attached.

Thanks,
  Felix

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