drm/amdgpu: Sync with VM root BO when switching VM to CPU update mode
This fixes an intermittent bug where a root PD clear operation still in progress could overwrite a PDE update done by the CPU, resulting in a VM fault. Fixes: 108b4d92 ("drm/amd/amdgpu: Update VM function pointer") Reported-by: Jay Cornwall <Jay.Cornwall@amd.com> Tested-by: Jay Cornwall <Jay.Cornwall@amd.com> Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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