Calculate preferred network based on phoneId for dumimy SubId

Once radio capabilties are available telephony will send
preferred network mode based on Sub ID, but at this time
Sub Id value is dummy value, so calculatePreferredNetworkType
will return default network mode value, this value may be different
from previously sent network mode. Fix this by calculate network
 mode based on phone ID for dummy SubId value.

Change-Id: Ibf1ad796ce1e31438f5dd984aac92a9bec583ad5