Considered network preference when simulating legacy data RAT

Correctly supported the legacy data RAT when both cellular
and IWLAN are in service. In this case only report
RAT as IWLAN when any type of APN is preferred on IWLAN.
Otherwise still use the RAT reported by cellular network
service.

Bug: 133516945
Test: Manual

Change-Id: Ifdddad1d5ee95f4576d5002a1b66caafc172cb58