[PATCH 2/2] drm/amdgpu: init iommu after amdkfd device init

[youling257]

my kernel config CONFIG_AMD_IOMMU=y CONFIG_AMD_IOMMU_V2=y.
linux kernel 5.15rc2 "drm/amdgpu: move iommu_resume before ip init/resume" cause my amd 3400g suspend to disk resume failed, have to press power button to force shutdown.
linux kernel 5.15rc5 "drm/amdgpu: init iommu after amdkfd device init" cause my amd 3400g blackscreen when boot enter my userspace.
i need revert "drm/amdgpu: init iommu after amdkfd device init" and "drm/amdgpu: move iommu_resume before ip init/resume" for my userspace, running androidx86 with mesa21.3 on amdgpu.