telephony: Handle RIL_APPSTATE_ILLEGAL

Map APPSTATE_ILLEGAL to APPSTATE_READY. APPSTATE_ILLEGAL means
card is valid but the subscription is rejected by network.
All ICC operations must be permitted.
Registration will anyway not happen as network would reject
registration request.

Change-Id: If4994371423d83343171be8b2a339ff79ff52c8e
CRs-Fixed: 380882