Remove healthd.

It is replaced by health HIDL HAL 2.0. Devices launching
with Android P and above must always have health HAL 2.0,
so health HAL is no longer needed for Android S.

Test: TH
Bug: 171260613
Change-Id: I7d94af36a880d7c658e879a3986924a786e58de9
3 files changed