Removed BatteryStatsService hidden API calls from Bluetooth

Replaced all BatteryStatsService hidden calls by
BatteryStatsManager system public calls. Removed try/catch
clauses as Exception are now handled in the manager.

Tag: #feature
Bug: 190442794
Test: atest BluetoothInstrumentationTests
Merged-In: Id0c381e2b41f2a4e2f16b29d1318ad2931960e4a
Change-Id: Id0c381e2b41f2a4e2f16b29d1318ad2931960e4a