USB: convert drivers/staging/* to use module_usb_driver()

This converts the drivers in drivers/staging/* to use the
module_usb_driver() macro which makes the code smaller and a bit
simpler.

Added bonus is that it removes some unneeded kernel log messages about
drivers loading and/or unloading.

Cc: "David Täht" <d@teklibre.com>
Cc: Marek Belisko <marek.belisko@gmail.com>
Cc: Al Cho <acho@novell.com>
Cc: Forest Bond <forest@alittletooquiet.net>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Huajun Li <huajun.li.lee@gmail.com>
Cc: Zac Storer <zac.3.14159@gmail.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: edwin_rong <edwin_rong@realsil.com.cn>
Cc: Ben Hutchings <ben@decadent.org.uk>
Cc: Julia Lawall <julia@diku.dk>
Cc: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: Joe Perches <joe@perches.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: "John W. Linville" <linville@tuxdriver.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>