[rilmodem] fix CF to support all the service classes

rilmodem CF driver mapped service class 7 (default) to 1 telephony. This changes it to map 7 to 0 which seams to do the same trick. Also fixes a bug in handling query callback when more than one CF conditions are received.

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>