usb: dwc3: Remove extra format specifier

Commit 1ed5d3ff ("usb: dwc3: replace %p with %pK") added
extra format specifier in dwc3_trace. This change removes extra
format specifier from dwc3_trace function which leads to page fault.

Change-Id: I172165b1f1716dc3083a22fba97559288acacf5a
Signed-off-by: Pratham Pratap <prathampratap@codeaurora.org>