[Port from R2] usb/penwell_otg: fix ULPI polling error

[Port from R2] usb/penwell_otg: fix ULPI polling error

BZ: 33238

Write 0x16 register after starting ULPI polling. This will
make sure even if 0x16 register was changed by unknown
reason before ULPI polling, it never causes reseting
controler all the time.

Change-Id: I47e2c613c1d7ea5754558d593bc37a0f9739f4de
Signed-off-by: Wu, Hao <hao.wu@intel.com>
Reviewed-on: http://android.intel.com:8080/45914
Reviewed-by: Zhuang, Jin Can <jin.can.zhuang@intel.com>
Reviewed-by: Tang, Richard <richard.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>