BatteryService: expose capacity level API

Using CAPACITY LEVEL as a key indicator of battery demand
enables systems and applications to make informed decisions
about power management and resource utilization.

Bug: 347860143
Change-Id: I55218ad1aadc09706ac82d4b401310467b94d9b4
Signed-off-by: Jenny Ho <hsiufangho@google.com>
3 files changed