This adds a new Kconfig option, so now all the usb peripheral
controllers have the same way to enable debug files (or more
typically, disable them).


Several of the USB peripheral controller drivers have a /proc/driver/udc
file that's handy when debugging, but probably not wanted otherwise.
This patch adds CONFIG_USB_GADGET_DEBUG_FILES, and uses it to replace
some driver-internal defines.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>