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USB device is connected before UOS is booted up, this scenario is called 'cold plug' for easy to refer. Under 'cold plug' situation, the libusb will not report 'connect' event to device model, hence UOS will not discover 'cold plugged' device. This patch add support to 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: #1242