USB: OTG: msm: Add support for MHL arbitration

MHL discovery is initiated upon detecting ID ground state.
This happens via an ID interrupt or charger detection work.
Allow low power mode when MHL cable is connected.

Change-Id: I3565817b53eb444509cf56269103921814147af9
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Abhishek Kharbanda <akharban@codeaurora.org>
Signed-off-by: Manoj Rao <manojraj@codeaurora.org>