Enhance overlayconfig api for satellite access controller

Bug: 379944543
Flag: com.android.internal.telephony.flags.carrier_roaming_nb_iot_ntn
Test: atest SatelliteManagerTestOnMockService to check whether enhanced API works as intended

Change-Id: I7ade0175f4a440990a3e9ee83252113d9beccd43
1 file changed