[DU03-1]Remove INetworkStatsService from BatteryStatsImpl

Expose systemapi NetworkStats.getDetailedUidStats for use by
BatteryStats.

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 NetworkStatsServiceTest
CTS-Coverage-Bug: 213437796
Change-Id: I40d713923278f4654d67bb4d12155cea85c10447