usb: dwc3-msm: Ensure hardware is reset during role change

Introduce additional WAIT_FOR_LPM input flag to ensure USB
enters low power mode after stop_peripheral or stop_host.
This makes sure that USB hardware is reset after LPM for
cases where quick transition to host mode happens while
its child was still preventing dwc3 to enter low power mode.
In the absence of h/w reset after stop_peripheral, host mode
doesn't work.

Change-Id: I67e4fcdc11a3337e3e90b4ca8f461e328a6e8ecf
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>