V4L/DVB: Add firmware v2.4 to xc2028/xc3028 extracting tool

From: Stefan Ringel <stefan.ringel@arcor.de>

The firmware were seen to be needed with some tm6000 devices that don't
work with version 2.7.

Thanks-to: Bee Hock Goh <beehock@gmail.com>
Signed-off-by: Stefan Ringel <stefan.ringel@arcor.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>