Use sub specific telephony for emergency supl

In multi-sim cases, we need to get the sub specific
telephony service in order to get the correct value
from functions getNetworkType and getServiceState
for the active sub instead of the default sub.

Bug: 150115901
Change-Id: Icb2e50500fe567fa1fee14eaaf04f0b308bc6cc6
CRs-fixed: 2616763