usb: define USB_SPEED_SUPER_PLUS speed for SuperSpeedPlus USB3.1 devices

usb: define USB_SPEED_SUPER_PLUS speed for SuperSpeedPlus USB3.1 devices

commit 8a1b2725a60d3267135c15e80984b4406054f650 upstream.

Add a new USB_SPEED_SUPER_PLUS device speed, and make sure usb core can
handle the new speed.
In most cases the behaviour is the same as with USB_SPEED_SUPER SuperSpeed
devices. In a few places we add a "Plus" string to inform the user of the
new speed.

[js] backport to 3.12: no use_new_scheme yet

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>