Fix requestProvisionSubscriberId related API to work properly

Bug: 351278182
Test: atest SatelliteManagerTestOnMockService
Test: manual test with SatelliteTestApp b/351278182#comment2
verify requestProvisionSubscriberIds, requestIsSatelliteProvisioned and provisionSatellite
Flag: com.android.internal.telephony.flags.carrier_roaming_nb_iot_ntn

Change-Id: I8001c074176807ae5f38e11acbbff10ba2d77a91