Some operator supports multiple VILTE, both two SIM cards can make VILTE call. We need to record VILTE data to different interface. Now NetworkStatsService has only one VILTE data interface: "vt_data0". All VILTE data stats will be recorded in this interface. Bug: 130871087 Test: NetworkStatsServiceTest#testDualVilteProviderStats Change-Id: I000ec756827bc42cac88dd0a2ca6b7999252357e