drm/amdgpu: fix buffer funcs setting order on suspend

We need to disable this after the last eviction
call, but before we disable the SDMA IP.

Fixes: b70438004a ("drm/amdgpu: move buffer funcs setting up a level")
Link: https://lore.kernel.org/r/87edgv4x3i.fsf@vps.thesusis.net
Reviewed-by: Luben Tuikov <ltuikov89@gmail.com>
Tested-by: Phillip Susi <phill@thesusis.net>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Phillip Susi <phill@thesusis.net>
Cc: Luben Tuikov <ltuikov89@gmail.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

@@ -4527,6 +4527,8 @@ int amdgpu_device_suspend(struct drm_device *dev, bool fbcon)
 	if (r)
 		return r;
 
+	amdgpu_ttm_set_buffer_funcs_status(adev, false);
+
 	amdgpu_fence_driver_hw_fini(adev);
 
 	amdgpu_device_ip_suspend_phase2(adev);