usb: dwc3: Pass USB connector type info from device tree

Currently driver is using power supply property to query
USB connector type. But on some targets power supply property
may not be available. Hence pass the connector type info from
HW platform specific device tree file using qcom,connector-type-uAB
property.

Change-Id: I17e18a12cb9520e36d02b207cffcd26a85f84f88
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>