media: uvcvideo: Fix bit overflow in uvc_probe_video

probe->dwMaxPayloadTransferSize is a 32bit value, but bandwidth is 16bit. This
may lead to a bit overflow.

Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>