[media] qt1010: do not change frequency during init

Changing cached frequency during init is something no-no.
Make it behave a little bit better. After that device could
survive from suspend/resume when streaming is ongoing.

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