Revert "usb: gadget: uvc: limit isoc_sg to super speed gadgets"

This reverts commit 19905240.

It was a new feature, and it doesn't even work properly yet, so revert
it from this branch as it is not needed for 6.1-final.

Cc: Michael Grzeschik <m.grzeschik@pengutronix.de>
Cc: stable <stable@kernel.org>
Fixes: 19905240

 ("usb: gadget: uvc: limit isoc_sg to super speed gadgets")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>