power: smb1351: enable OTG functionality

Define a boolean device property to enable OTG(On-The-Go)
functionality.

While at it fix the otg regulator initial data.

Change-Id: I4347ccf0c48bdf11f84618fcd5d3b8f132ef6c88
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>