pnwotg_test: send usb warning when test device is not supported

pnwotg_test: send usb warning when test device is not supported

BZ: 30607

Notify usb warning when test device is not supported by pnwotg_test
driver.

Change-Id: Idafbea1cb2d2668b929bc63ee5351a88bd95a6f0
Signed-off-by: Wu, Hao <hao.wu@intel.com>
Reviewed-on: http://android.intel.com:8080/49178
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>