Add a Windows INF file for the non-standard USB gadget devices.
Add a Windows INF file for the non-standard USB gadget devices.

This file instructs Windows to load the WinUSB driver for the default
test gadget configuration and the USB echo gadget configuration. As
this INF file is not part of a signed driver package it must be
manually loaded against the device.

Windows 8 will also load WinUSB if it finds the appropriate compatible
ID descriptor on the device. A later patch will add this descriptor
in order to bypass the manual installation step required on previous
versions of Windows.

BUG=

Review URL: https://codereview.chromium.org/803723002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#308365}

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