[media] rtl2830: use .get_if_frequency()

Use .get_if_frequency() as all used tuner drivers
(mt2060/qt1010/mxl5005s) supports it.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
3 files changed