cros_scripts: Update vm usb passthrough

Change usb passthrough to take a vendorid, productid
pair instead of a hostbus, hostaddr pair.

BUG=chromium:542466
TEST=Tested passthrough with a peppy.

Change-Id: Idc9b01b2bf1f6c91ac59cdef66621bd0db8b47b9
Reviewed-on: https://chromium-review.googlesource.com/305265
Commit-Ready: Matthew Sartori <msartori@chromium.org>
Tested-by: Matthew Sartori <msartori@chromium.org>
Reviewed-by: Gilad Arnold <garnold@chromium.org>
2 files changed