tune: remove usage of fe_type_t

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
tune: remove usage of fe_modulation_t

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
tune: remove dependency on linuxtv headers

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>