Provide a BatteryStats interface noteCpuWakingBluetoothProxyPacket

To let Wear sysproxy packets associate with CPU wakeup from Bluetooth subsystem

Test: tested locally, wear the watch for a night and examined that the generated bugreport is WAI
Test: atest PowerStatsTests:CpuWakeupStatsTest
Bug: 361339157
Flag: EXEMPT the codepath is guarded by aconfig flags downstream at sysproxy service.
Change-Id: I1aef3de6b0eeefa1e3261526b249aa9e09f3f28f