usb: dwc3-msm: Route DWC3 USB3.0 controller signals to the primary port

The primary USB port can be connected to DWC3 USB3.0 controller via
UTMI+ interface or USB2.0 controller via ULPI interface.  Program
the MUX inside PHY wrapper block to route USB3.0 controller signals
to the primary port.

Change-Id: Ibf0e9f30e836740dcf3213cd7e3495dfba2f08a2
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Ido Shayevitz <idos@codeaurora.org>