V4L/DVB (12388): dvb-usb: fix tuning with Cinergy T2

cinergyInitialize param.flags.

Signed-off-by: Eberhard Mattes <eberhard.mattes@web.de>
Signed-off-by: Thierry MERLE <thierry.merle@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>