Telephony: Use regular poll state when radio off for RIL versions < 10

The modemTriggeredPollState breaks airplane mode on some devices.
Although the UI shows that airplane mode is activated, the fact is that
the radio remains active and in service. By using original AOSP pollState()
here, service state in sim status shows correctly radio off.

Change-Id: If2ab5b088a13b1a159e01f82fbea1f58a77b64cd