Fix for data and roaming icons

- Enable data connected flag based on the data state.

- Do not display data icon in data connected state
if radio type is unknown

- Show service if either voice/data is in
service if ro.config.combined_signal is true

- Consider eri only when in service

- Add in service check to isCdmaEri.
roaming related information
in registration state will not be valid
during out of service

Change-Id: I915421a6f5906d80ed5b8dd9c433115ad5df1f14
CRs-Fixed: 303275, 326204, 326634, 333008, 339297