Bring back ERI into CDMA-LTE mode

Use ERI mechanism for roaming determination in CDMA-LTE mode.
Also display SPN name from CSIM card as "SPN" field in the status bar.
PLMN field will be derived from ERI text as done in original CDMA phone.

Bug: 4970448
Change-Id: I21382b15e148a8451f4c3fcbbb5d1ed296e41b5a