Fixing SDMA TO after GPU reset

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Attached patch fixes SDMA TO after GPU reset, it's a regression caused 
by cbd5285 drm/amdgpu: move setting the GART addr into TTM.

But to me it looks safer just to revert the original patch all together 
since we never can predict for sure if VM flush will take place and so 
it's safer to just always assign job->vm_pd_addr.

Andrey

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