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: Ia441b0eda35ef66be8d8aec112e52cf4397180b9