Add carrier config KEY_CARRIER_ROAMING_NTN_EMERGENCY_CALL_TO_SATELLITE_HANDOVER_TYPE_INT

for handling handover to satellite 911

Flag: com.android.internal.telephony.flags.carrier_roaming_nb_iot_ntn

Test: Test: manual, cts: atest CarrierConfigManagerTest
Bug: 350397936
Change-Id: I1ee8a1fdf4653cea288cf68fda559f0c33a98b45