Support for LTE Signal Strength over NTN network

1.Define the RSRP, RSRQ ,RSSNR thresholds and Signal bar for LTE_NTN in Carrier config.
2.When CellSignalStrengthLte#updateLevel is called with a serviceState object using NTN, using the new defined LTE_NTN_RSRP, RSRQ, RSSNR thresholds and signal bar

Bug: 311272134
Test: atest SignalStrengthTest, atest SignalStrengthControllerTest
Test:manual test.
After NTN is connected,
1. verify SMS working.
2. verify Voice call and Internet blocked.
3. verify whether the NTN_LTE signal thresholds config is used.

Change-Id: I0f8310d5383f890cbe6b101dbe2eaddfd5244b9f