i386_ctp_defconfig: enable usb penwell_otg test mode

i386_ctp_defconfig: enable usb penwell_otg test mode

BZ: 31292

Enable usb penwell_otg_test mode.

Change-Id: I4547d915ab42b7f8f07fcdd218ac5d82d31de74f
Signed-off-by: Wu, Hao <hao.wu@intel.com>
Reviewed-on: http://android.intel.com:8080/43112
Reviewed-by: Tang, Richard <richard.tang@intel.com>
Reviewed-by: Zhuang, Jin Can <jin.can.zhuang@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>