SignalStrength: Hotfix TD-SCDMA 1 + 2

These checks need to be reviewed, they're making unwarranted assumptions
about signal value formats and possible tech combos.
This appears to work for all possible scenarios I was able to test,
but the "LTE checks" shouln't be necessary at all.

Change-Id: I5cd042896fe9c929c6c188b064aa589871eab704
Merge "SignalStrength: Hotfix TD-SCDMA 1 + 2" into kitkat3