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When USB hub is disconnected, its connection status is not cleared in the DM, this defect will cause the related assigned port could not be used any more. This patch is used fix this issue. Signed-off-by: Xiaoguang Wu <xiaoguang.wu@intel.com> Reviewed-by: Liang Yang <liang3.yang@intel.com> Acked-by: Yu Wang <yu1.wang@intel.com> Tracked-On: #1365