V4L/DVB (4088): Fixes for card cx88 #50

The description of the card has been updated to it's full name/model.
The tuner has also been switched to a more compatible one (radio
wasn't working, now it is)

Signed-off-by: Ricardo Cerqueira <v4l@cerqueira.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>