drm/amdgpu: report DC not supported if virtual display is enabled (v2)

Virtual display is non-atomic so report false to avoid checking
atomic state and other atomic things at runtime.

v2: squash into the sr-iov check
Acked-by: Nirmoy Das <nirmoy.das@amd.com>
Acked-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -2861,7 +2861,7 @@ bool amdgpu_device_asic_has_dc_support(enum amd_asic_type asic_type)
  */
 bool amdgpu_device_has_dc_support(struct amdgpu_device *adev)
 {
-	if (amdgpu_sriov_vf(adev))
+	if (amdgpu_sriov_vf(adev) || adev->enable_virtual_display)
 		return false;
 
 	return amdgpu_device_asic_has_dc_support(adev->asic_type);