usb/penwell_otg: stop ulpi polling in device suspended mode

usb/penwell_otg: stop ulpi polling in device suspended mode

BZ: 33241

The 11897 workaround patch introduced a problem that keeps
ulpi polling even if the device is in suspended mode, which
results in timeout and unexpected reset to SW/HW. This patch
is ported from OTC branch.

Change-Id: Ib42c1769926e02f7407c0ee5961998d68aa2a20d
Signed-off-by: Wu, Hao <hao.wu@intel.com>
Reviewed-on: http://android.intel.com:8080/45917
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>