charger: uses health HAL service.

hwservicemanager starts in charger, so directly get the health HAL
service.

Also sets up Android base kernel logging.

Bug: 142674987

Test: turn off device and charge, health HAL starts before charger, and inspect logs
      to confirm charger is reading from health HAL
Test: make health HAL start after charger, and inspect logs to confirm
      charger is reading from health HAL.

Change-Id: I5ba50a4b931735d1d14a50940e37c1e407dda34d