usb/hub: send usb warning to user space when get descriptor failed.

usb/hub: send usb warning to user space when get descriptor failed.

BZ: 30607

Notify usb warning when get descriptor failed.

Change-Id: I6f39a03c35abf10b88f2a138b2b9392882429839
Signed-off-by: Wu, Hao <hao.wu@intel.com>
Reviewed-on: http://android.intel.com:8080/49177
Reviewed-by: Zhuang, Jin Can <jin.can.zhuang@intel.com>
Reviewed-by: Tang, Richard <richard.tang@intel.com>
Reviewed-by: Tang, Jianqiang <jianqiang.tang@intel.com>
Reviewed-by: Meng, Zhe <zhe.meng@intel.com>
Tested-by: Meng, Zhe <zhe.meng@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>