V4L/DVB (11517): v4l: remove driver-core BUS_ID_SIZE

The name size limit is gone from the driver core, the BUS_ID_SIZE
value will be removed.

Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>