ril: update ril extensions
this is borrowed from p880; it seems the p880 ril is much closer to the p940 ones than the p760s.
see https://github.com/CyanogenMod/android_device_lge_p880/blob/cm-10.1/ril/telephony/java/com/android/internal/telephony/X3RIL.java

it includes a custom queryCallForwardStatus and a RADIO_STATE_CHANGED hack. this will fix the following:
* aeroplane mode (takes a bit to reassociate with celltowers but it definately works now)
* call forwarding settings