[media] dvb-usb-dvbsky: Add support for TechnoTrend S2-4650 CI

TechnoTrend TT-connect S2-4650 CI seems to be a variation of
the DVBSky S960CI device.

Signed-off-by: Olli Salonen <olli.salonen@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>