MdeModulePkg/UsbBus: Fix system hang when failed to uninstall UsbIo
    
    When "reconnect -r" is typed in shell, UsbFreeInterface() is called
    to uninstall the UsbIo and DevicePath. But When a UsbIo is opened
    by a driver and that driver rejects to close the UsbIo in Stop(),
    the uninstall doesn't succeed.
    But UsbFreeInterface () frees the DevicePath memory without check
    whether the uninstall succeeds.
    It leads to the DXE core database contain a DevicePath instance but
    that instance's memory is freed.
    Assertion happens when someone calls InstallProtocol(DevicePath)
    because the InstallProtocol() checks all DevicePath instance to
    find whether the same one exits in database.
    
    We haven't seen any USB device driver which rejects to close UsbIo
    in Stop(), but it's very likely.
    
    Contributed-under: TianoCore Contribution Agreement 1.0
    Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
    Reviewed-by: Feng Tian <feng.tian@intel.com>
    Reviewed-by: Star Zeng <star.zeng@intel.com>
    Cc: Hao A Wu <hao.a.wu@intel.com>