usb: dwc3: Update otg state when charger detection is skipped

The OTG state is not getting set when the cable is plugged but
charger detection is skipped. This leads to cable disconnection
not getting properly handled and can result in invalid register
accesses. Fix this by properly updating the OTG state.

CRs-fixed: 643367
Change-Id: Ie0b96cffad9f819cd016814614ec8758ca119d23
Signed-off-by: Vamsi Krishna <vskrishn@codeaurora.org>
Signed-off-by: Guang Jian Zeng <gzeng@codeaurora.org>