Handle CarrierRoamingSatelliteSessionStats instances

CarrierRoamingSatelliteSessionStats has sparse array of instances for
each subId held within it called sCarrierRoamingSatelliteSessionStats.
When an actual instance of CarrierRoamingSatelliteSessionStats is
created, the subsequent test cases wouldn't be able to mock
CarrierRoamingSatelliteSessionStats' internals, leading to unexpected
test failures. So, creating clean up instaces for
CarrierRoamingSatelliteSessionStats and then using the same before
all test methods of SatelliteControllerTest.

Bug: 433108101
Flag: EXEMPT bugfix
Test: atest
GsmInboundSmsHandlerTest.java#testNewSms_filterInvoked_noBroadcastsSent
SatelliteControllerTest.java#testSatellitePerPlmnConfigurationUpdate_ForCarrierWithBothAutoAndManualSatellite

Change-Id: If31c43c7d0f24d7d680aba08ab2710e8ce0aa265