This patch teaches "gadget zero" enough about OTG to pass simple USBCV
tests, mostly by including OTG descriptors in each configuration.  It
tests and reports OTG status, as reported by the USB controller driver.

It also adds an option to build gadget zero to act as the designated
OTG "HNP Test Device", which exists primarily to trigger HNP.  However,
it won't currently request HNP.

Includes other minor tweaks:  delete a timer on disconnect, reset
the req->zero flag, don't autoresume after disconnect.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>