Gadget API update.  Covers OTG support, lists a few more
types of hardware support, mentions gadget driver updates
including RNDIS, serial with CDC-ACM, and gadgetfs AIO.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>