healthd connect to health@1.0 hal

This is the original code path (BatteryService
-> healthd -> health 1.0 HAL). This ensures
upgrade-ability for old devices to P.

This is a partial revert of
287c41ff, with
some modifications to the original healthd_board_*
functions for healthd.

Bug: 65990106
Test: VTS test for healthd and health service
Change-Id: If1c65e64e2fd6750369d52c8051ca6aa2b57ef27