usb: dwc3: Add support for 4 PHYs for dual port controller

Add 2 new PHY instances (HS and SS) in dwc3 and dwc3-msm
structures. Probe and initialize them when the controller is
dual port capable. This capability is advertised by cores
supporting only host mode using the DT flag 'qcom,dual-port'.

Update PHY1 flags wherever applicable while maintaining single
port controller support.

Avoid workaround of SSPHY powerdown as a part of HS device
connect because of the known HW bug of the other SSPHY going in
and out of P3 when data transfers are being done.

Change-Id: If52fd6383cc2da8b763c774d2ad688448f90aea0
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>