drm/amdgpu: fix buffer funcs setting order on suspend harder

Part of commit c0358198 ("drm/amdgpu: fix buffer funcs setting order on suspend")
got dropped accidently.  Add it back.

Fixes: c0358198 ("drm/amdgpu: fix buffer funcs setting order on suspend")
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -4589,8 +4589,6 @@ int amdgpu_device_suspend(struct drm_device *dev, bool fbcon)
 
 	amdgpu_ras_suspend(adev);
 
-	amdgpu_ttm_set_buffer_funcs_status(adev, false);
-
 	amdgpu_device_ip_suspend_phase1(adev);
 
 	if (!adev->in_s0ix)