Change return type of isSatelliteSupported from Boolean to boolean

Bug: 274136093
Test: Emergency/normal call, SMS, MMS with live network.
atest com.android.internal.telephony.satellite.SatelliteSOSMessageRecommenderTest
atest com.android.internal.telephony.satellite.SatelliteSessionControllerTest
atest android.telephony.cts.SatelliteManagerTest

Change-Id: I78aa245b0656cf994b21c449ba0e4e7f5058364b