usb/penwell_otg: add charger detection flow for Clovertrail

usb/penwell_otg: add charger detection flow for Clovertrail

BZ: 14625

This patch adds charger detection flow for Clovertrail, which
is different than what we used for MFLD.

Change-Id: I7d0442967babf08aa31f42209f1c79b11ce8c6d7
Signed-off-by: Wu, Hao <hao.wu@intel.com>
Reviewed-on: http://android.intel.com:8080/33883
Reviewed-by: Wang, Feng A <feng.a.wang@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>