[DU03]Remove INetworkStatsService from BatteryStatsImpl

BatteryStatsImpl is using INetworkStatsService APIs, which
cannot be accessed after moving into the mainline module. So, replace
and remove those hidden API usages.

Bug: 210066922
Test: atest BatteryStatsImplTest WifiPowerCalculatorTest
            MobileRadioPowerCalculatorTest
CTS-Coverage-Bug: 213437796
Change-Id: I584897ff8ba303c717a9df3756c9f6778c1cfb10