usb: host: Add event debug framework to xhci-dbg

Add event logging to xhci-dbg. This alolows multiple
xhci host controllers to log suspend, resume and URB
submission and completion events for all the endpoints
based on the mask value set by controller driver.

Change-Id: I4b812b16664747e465eccbf820c15d6741cc09d8
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>