V4L/DVB (6909): cx23885: fix bad use count caused by tda18271 being probed by tda8290

Don't allow the tda8290 module to probe and attach the tuner module,
causing incorrect use counts when using dvb_attach.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>