usb: dwc3-msm: Rename "qcom" vendor prefix to "qti"

The vendor prefix "qcom" is being replaced with "qti" to
comply with new naming conventions. Update properties and
compatible strings in the dwc3-msm glue driver as well as
existing device tree bindings.

Change-Id: I9de734073d2eec963d4f0d881da76c412db6fe44
Signed-off-by: Jack Pham <jackp@codeaurora.org>